begrime (v.)youdaoicibaDictYouDict[begrime 词源字典]
1530s, from be- + grime (n.). Related: Begrimed.[begrime etymology, begrime origin, 英语词源]
begrudge (v.)youdaoicibaDictYouDict
mid-14c., from be- + Middle English grucchen "to murmur" (see grudge). Related: Begrudged; begrudging; begrudgingly.
beguile (v.)youdaoicibaDictYouDict
early 13c., from be- + guile (v.). Related: Beguiled; beguiling.
beguiling (adj.)youdaoicibaDictYouDict
c. 1400, present participle adjective from beguile.
Beguine (n.)youdaoicibaDictYouDict
late 15c., from French béguine (13c.), Medieval Latin beguina, a member of a women's spiritual order said to have been founded c.1180 in Liege in the Low Countries. They are said to take their name from the surname of Lambert le Bègue "Lambert the Stammerer," a Liege priest who was instrumental in their founding, and it's likely the word was pejorative at first.

The order generally preserved its reputation, though it quickly drew imposters who did not; nonetheless it eventually was condemned as heretical. A male order, called Beghards founded communities by the 1220s in imitation of them, but they soon degenerated (compare Old French beguin "(male) Beguin," also "hypocrite") and wandered begging in the guise of religion; they likely were the source of the words beg and beggar, though there is disagreement over whether Beghard produced Middle Dutch beggaert "mendicant" or was produced by it.

Cole Porter's "Begin the Beguine" (1935) refers to a kind of popular dance of West Indian origin, from French colloquial béguin "an infatuation, boyfriend, girlfriend," earlier "child's bonnet," and before that "nun's headdress" (14c.), from Middle Dutch beggaert, ultimately the same word.
begun (v.)youdaoicibaDictYouDict
past participle of begin.
behalf (n.)youdaoicibaDictYouDict
c. 1300, behalve (with dative suffix), from Old English (him) be healfe "by (his) side," and on (his) healfe "on (his) side," from healfe "side" (see half).
behave (v.)youdaoicibaDictYouDict
early 15c., from be- intensive prefix + have in sense of "to have or bear (oneself) in a particular way, comport" (compare German sich behaben, French se porter). Cognate Old English compound behabban meant "to contain," and alternatively the modern sense of behave might have evolved from behabban via a notion of "self-restraint." Related: Behaved; behaving.
behavior (n.)youdaoicibaDictYouDict
late 15c., essentially from behave, but with ending from Middle English havour "possession," a word altered (by influence of have) from aver, noun use of Old French verb aveir "to have."
behavioral (adj.)youdaoicibaDictYouDict
1927, in psychology, from behavior + -al (1).
behaviorism (n.)youdaoicibaDictYouDict
coined 1913 by U.S. psychologist John B. Watson (1878-1958) from behavior + -ism. Behaviorist is from the same time.
behaviour (n.)youdaoicibaDictYouDict
chiefly British English spelling of behavior; for suffix, see -or.
behavioural (adj.)youdaoicibaDictYouDict
chiefly British English spelling of behavioral (q.v.); for spelling, see -or.
behead (v.)youdaoicibaDictYouDict
Old English beheafdian, from be-, here with privative force, + heafod (see head (n.)). Related: Beheaded; beheading.
beheld (v.)youdaoicibaDictYouDict
past tense and past participle of behold.
behemoth (n.)youdaoicibaDictYouDict
late 14c., huge biblical beast (Job xl:15), from Latin behemoth, from Hebrew b'hemoth, usually taken as plural of intensity of b'hemah "beast." But the Hebrew word is perhaps a folk etymology of Egyptian pehemau, literally "water-ox," the name for the hippopotamus.
Long before Jumbo was dreamed of, a hippo was exhibited by George K. Bailey, who invented the tank on wheels now used so generally in the circuses. The beast was advertised as "the blood sweating Behemoth of Holy Writ," and he made several men rich. [Isaac F. Marcosson, "Sawdust and Gold Dust," in "The Bookman," June 1910]
behest (n.)youdaoicibaDictYouDict
Old English behæs "a vow," perhaps from behatan "to promise" (from be- + hatan "command, call;" see cite) and confused with obsolete hest "command," which may account for the parasitic -t as well as the Middle English shift in meaning to "command, injunction" (late 12c.).
behind (adv.)youdaoicibaDictYouDict
Old English behindan "behind, after," from bi "by" + hindan "from behind" (see hind (adj.)). The prepositional sense emerged in Old English. Euphemistic noun meaning "backside of a person" is from 1786. Phrase behind the times is from 1905. Behind the scenes (1711) is from the theater; figurative sense attested by 1779.
behindhand (adv., adj.)youdaoicibaDictYouDict
1520s, from behind + -hand, probably on model of beforehand.
behold (v.)youdaoicibaDictYouDict
Old English bihaldan (West Saxon behealdan) "give regard to, hold in view," also "to keep hold of, to belong to," from be- + haldan, healdan (see hold). Related: Beheld; beholding. A common West Germanic compound, compare Old Saxon bihaldan "hold, keep," Old Frisian bihalda, Old High German bihaltan, German behalten, but "[t]he application to watching, looking, is confined to English" [OED].