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climb [climb 词源字典]: 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[climb etymology, climb origin, 英语词源]
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
climb (v.): Old English climban "raise oneself using hands and feet; rise gradually, ascend; make an ascent of" (past tense clamb, past participle clumben, clumbe), from West Germanic *klimban "go up by clinging" (cognates: Dutch klimmen "to climb," Old High German klimban, German klimmen). A strong verb in Old English, weak by 16c. Most other Germanic languages long ago dropped the -b. Meaning "to mount as if by climbing" is from mid-14c. Figurative sense of "rise slowly by effort" is from mid-13c. Related: Climbed; climbing.
cling (v.): Old English clingan "hold fast, adhere closely; congeal, shrivel" (strong verb, past tense clang, past participle clungen), from Proto-Germanic *klingg- (cognates: Danish klynge "to cluster;" Old High German klinga "narrow gorge;" Old Norse klengjask "press onward;" Danish klinke, Dutch klinken "to clench;" German Klinke "latch").

The main sense shifted in Middle English to "adhere to" (something else), "stick together." Of persons in embrace, c. 1600. Figuratively (to hopes, outmoded ideas, etc.), from 1580s. Of clothes from 1792. Related: Clung; clinging.
hang on (v.): 1860, "to remain clinging," 1860, especially "cling fondly to" (1871); see hang (v.) + on (adv.). As a command to be patient, wait a minute, from 1936, originally in telephone conversations.
loose (adj.): early 13c., "not securely fixed;" c. 1300, "unbound," from Old Norse lauss "loose, free, vacant, dissolute," cognate with Old English leas "devoid of, false, feigned, incorrect," from Proto-Germanic *lausaz (cognates: Danish løs "loose, untied," Swedish lös "loose, movable, detached," Middle Dutch, German los "loose, free," Gothic laus "empty, vain"), from PIE *leu- "to loosen, divide, cut apart" (see lose). Meaning "not clinging, slack" is mid-15c. Meaning "not bundled" is late 15c. Sense of "unchaste, immoral" is recorded from late 15c. Meaning "at liberty, free from obligation" is 1550s. Sense of "rambling, disconnected" is from 1680s. Figurative sense of loose cannon was in use by 1896, probably from celebrated image in a popular story by Hugo:
You can reason with a bull dog, astonish a bull, fascinate a boa, frighten a tiger, soften a lion; no resource with such a monster as a loose cannon. You cannot kill it, it is dead; and at the same time it lives. It lives with a sinister life which comes from the infinite. It is moved by the ship, which is moved by the sea, which is moved by the wind. This exterminator is a plaything. [Victor Hugo, "Ninety Three"]
Loose end in reference to something unfinished, undecided, unguarded is from 1540s; to be at loose ends is from 1807. Phrase on the loose "free, unrestrained" is from 1749 (upon the loose).
prehensile (adj.): 1771, from French préhensile "adapted for grasping" (Buffon), from Latin prehensus, past participle of prehendere "to grasp, seize, get hold of," from prae- "before" (see pre-) + -hendere, from PIE root *ghend- "to seize, take" (see get (v.)). Latin -hendere is related to hedera "ivy," via notion of "clinging."