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clause [clause 词源字典]: clause: [13] The etymological notion underlying clause is of ‘closing’ or ‘termination’. The word derives ultimately from Latin claudere (source of English close) and was originally applied either as a rhetorical term to the conclusion of a sentence, or as a legal term to the termination of a legal argument. Gradually, in both cases, the element of finality fell away, leaving the senses ‘short sentence’ and ‘section of a legal document’, which passed into English.

The past participle of Latin claudere, clausus, probably produced an unrecorded noun *clausa (known only in its diminutive form clausula), which passed into English via Old French clause.
=> clavier, close[clause etymology, clause origin, 英语词源]
claustrophobia: claustrophobia: see cloister
clavier: clavier: [18] The Latin word for ‘key’ was clāvis (it was related to claudere ‘close’). Its application to the keys of a musical instrument has contributed two words to English: clavier, which came via French or German from an unrecorded Latin *clāviārius ‘key-bearer’; and clavichord [15], from medieval Latin clāvichordium, a compound of Latin clāvis and Latin chorda, source of English chord.

Its diminutive form clāvicula was applied metaphorically to the collar-bone (hence English clavicle [17]) on account of the bone’s resemblance to a small key. And in Latin, a room that could be locked ‘with a key’ was a conclāve – whence (via Old French) English conclave [14]. Also related to clāvis is cloy.
=> clavicle, close, cloy, conclave
clay: clay: [OE] Clay is named from its consistency – its stickiness, its squidginess, its capacity for being smeared. Its ultimate source is the Indo- European base *gloi-, *glei-, *gli-, from which English also gets glue and gluten. From it was descended the Germanic base *klai-, on which was formed West Germanic *klaijō-. This passed into Old English as clæg – hence modern English clay. (Clammy comes from the same Germanic source, and clag, from which we get claggy ‘muddy’, is essentially the same word as clay, although it reached English via a Scandinavian route.)
=> clammy, clean
claymore: claymore: see gladiator
clean: clean: [OE] Etymologically, clean and German klein ‘small’ are the same word. Both go back to West Germanic *klainoz, which meant ‘clear, pure’, but whereas the English adjective has stayed fairly close to the original meaning, the German one has passed via ‘clean’, ‘neat’, ‘dainty’, and ‘delicate’ to ‘small’. It has been speculated that *klainiz was based on *klai-, which connoted ‘stickiness’ (it was the source of English clay and clammy).

The reasoning is that something sticky, perhaps from a coating of oil, would have been perceived as having a clear or shiny surface, and there may also have been a suggestion of the purity conferred by a ceremonial anointing with oil. The derivatives cleanse and cleanly (whence cleanliness) are both Old English formations.
=> clammy, clay, cleanse
clear: clear: [13] Clear comes via Old French cler from Latin clārus (source also of English claret and clarion [14]). It has been suggested that clārus is related to calāre ‘call out’ (whence English council). Latin derivatives that have come down to English are clārificāre, from which English gets clarify [14], and clāritās, whence English clarity [16]. The Middle English spelling of the adjective is preserved in clerestory ‘upper storey of a church’ [15] (so named from its being ‘bright’ or ‘lighted’ with numerous windows).
=> claim, claret, clarion, clarity, clerestory, declare, low
cleave: cleave: [OE] There are two distinct verbs cleave in English, both of Germanic origin. Cleave ‘cut’ comes from Germanic *kleuban, which goes back to an Indo-European base *gleubh- (this also produced Greek glúphein ‘carve’, source of English hieroglyphics). Cleave ‘adhere’ can be traced back ultimately to an Indo-European base *gloi-, *glei-, *gli- ‘stick’, from which English also gets glue and gluten. Its Germanic descendant *klai- produced English clay and clammy, and *kli- developed into cleave.
=> clammy, clay, climb, glue, hieroglyphics
clench: clench: see cling
clerestory: clerestory: see clear
clerk: clerk: [11] Clerk and its relatives cleric and clergy owe their existence ultimately to a Biblical reference, in Deuteronomy xviii 2, to the Levites, members of an Israelite tribe whose men were assistants to the Temple priests: ‘Therefore shall they have no inheritance among their brethren: the Lord is their inheritance’. Greek for ‘inheritance’ is klēros, and so it came about that matters relating to the Christian ministry were denoted in late Greek by the derived adjective klērikós.

This passed into ecclesiastical Latin as clēricus, which was originally borrowed into late Old English as cleric or clerc, later reinforced by Old French clerc to give modern English clerk. Its presentday bureaucratic connotations, which emerged in the 16th century, go back to an earlier time when members of the clergy were virtually the only people who could read or write.

However, religious associations have of course been preserved in cleric [17], from ecclesiastical Latin clēricus, and clergy [13], a blend of Old French clergie (a derivative of clerc) and clerge (from the ecclestiastical Latin derivative clēricātus). The compound clergyman is 16th century.
=> cleric, clergy
clever: clever: [13] Clever is rather a mystery word. There is one isolated instance of what appears to be the word in an early 13th-century bestiary, where it means ‘dextrous’, and the connotations of ‘clutching something’ have led to speculation that it may be connected with claw. It does not appear on the scene again until the late 16th century, when its associations with ‘agility’ and ‘sprightliness’ may point to a link with Middle Dutch klever, of similar meaning. The modern sense ‘intelligent’ did not develop until the 18th century.
cliché: cliché: [19] Originally, French clicher meant literally ‘stereotype’ – that is, ‘print from a plate made by making a type-metal cast from a mould of a printing surface’. The word was supposedly imitative of the sound made when the mould was dropped into the molten type metal. Hence a word or phrase that was cliché – had literally been repeated time and time again in identical form from a single printing plate – had become hackneyed.
client: client: [14] The original status of a client was rather lowly: he was someone who was at another’s beck and call, and dependent on them. The word comes from Latin cliēns, an alteration of an earlier cluēns, the present participle of the verb cluēre ‘listen, follow, obey’; hence someone who was cliēns was always listening out for another’s orders, unable to take independent action (in ancient Rome it meant specifically a plebeian under the protection of a nobleman).

That sense is preserved in such English expressions as ‘client state’. The word’s more modern senses have developed through ‘person on whose behalf a lawyer acts’ in the 15th century to simply ‘customer’ in the 17th century.
cliff: cliff: [OE] Cliff comes from a prehistoric Germanic *kliban, of unknown origin (German klippe ‘crag’ is a collateral relative). The compound cliffhanger seems to have originated in the USA in the 1930s; it comes from the serial movies then popular, in which at the end of each episode the hero or heroine was left in some perilous situation, such as hanging off the edge of a cliff, not resolved until the next instalment.
climate: climate: [14] The notion underlying climate is of ‘sloping’ or ‘leaning’. It comes, via Old French climat or late Latin clīma (whence English clime [16]), from Greek klīma ‘sloping surface of the earth’, which came ultimately from the same source (the Indo-European base *kli-) as produced English lean. Greek geographers assigned the earth’s surface to various zones according to the angle which their ‘slope’ made with the rays of the sun (originally there were seven of these, ranging from 17 degrees of latitude North to 48 degrees, but later the system was elaborated so that each hemisphere was divided into 24 bands or ‘climates’ of latitude).

This was the sense in which the word passed into Latin, where it broadened out into simply ‘region’, and hence ‘weather associated with a particular area’.
=> ladder, lean
climax: climax: [16] Etymologically, a climax is a series of steps by which a goal is achieved, but in the late 18th century English, anticipating the culmination, started using it for the goal itself. It comes, via late Latin, from Greek klimax ‘ladder’, which was ultimately from the same source (the Indo-European base *kli-) as produced English lean. This came to be used metaphorically as a rhetorical term for a figure of speech in which a series of statements is arranged in order of increasing forcefulness, and hence for any escalating progression: ‘the top of the climax of their wickedness’, Edmund Burke 1793.

Whence modern English ‘high point’.
=> ladder, lean
climb: climb: [OE] The original notion contained in climb seems not to have been so much ‘ascent’ as ‘holding on’. Old English climban came from a prehistoric West Germanic *klimban, a nasalized variant of the base which produced English cleave ‘adhere’. To begin with this must have meant strictly ‘go up by clinging on with the hands and feet’ – to ‘swarm up’, in fact – but already by the late Old English period we find it being used for ‘rising’ in general. The original past tense clamb, which died out in most areas in the 16th century, is probably related to clamp ‘fastening’ [14].
=> clamp, cleave
cling: cling: [OE] The basic underlying sense of cling seems to be ‘stick, adhere’, but surviving records of the word in Old English reveal it only in the more specialized senses ‘congeal’ or ‘shrivel’ (the notion being that loss of moisture causes something to contract upon itself or adhere more closely to a surface). It is not really until the late 13th century that the more familiar ‘adhere’ (as in ‘a wet shirt clinging to someone’s back’) begins to show itself, and no hint that ‘clinging’ is something a human being can do with his or her arms emerges before the early 17th century.

The word goes back to a prehistoric Germanic base *klingg-, whose variant *klengk- is the source of English clench [13] and clinch [16].
=> clench, clinch
clinic: clinic: [17] Etymologically, a clinic is a place with ‘beds’. It comes ultimately from Greek klínē ‘bed’, which goes back to the Indo-European base *kli- ‘lean, slope’ (source also of English lean) and hence was originally ‘something on which one reclines’. The adjective derived from this, klīnkós, reached English via Latin clīnicus, having become specialized in meaning from ‘bed’ in general to ‘sick-bed’. Clinic was replaced as an adjective by clinical in the 18th century, but it continued on as a noun, originally in the sense ‘sick or bedridden person’.

This survived into the 19th century (‘You are free to roam at large over the bodies of my clinics’, E Berdoe, St Bernard’s 1887), and the modern sense ‘hospital’ did not arrive until the late 19th century, borrowed from French clinique or German klinik.
=> decline, lean