groom (n.1)youdaoicibaDictYouDict[groom 词源字典]
c. 1200 (late 12c. in surnames), grome "male child, boy;" c. 1300, "a youth, young man," also "male servant, attendant, minor officer in a royal or noble household ranking higher than a page; a knight's squire." Of unknown origin; no certain cognates in other Germanic languages. Perhaps from an unrecorded Old English *grom, *groma, which could be related to growan "to grow," and influenced by guma "man." Or perhaps from or influenced by Old French grommet "boy, young man in service, serving-man" (compare Middle English gromet "ship's boy," early 13c.). As the title of an officer of the English royal house from mid-15c. Specific meaning "male servant who attends to horses and stables" is from 1660s, from earlier combinations such as horse-groom, Groom of the Stables, etc.[groom etymology, groom origin, 英语词源]
groom (n.2)youdaoicibaDictYouDict
"husband-to-be at a wedding; newly married man," c. 1600 (usually as a correlative of bride), short for bridegroom (q.v.), in which the second element is Old English guma "man."
groom (v.)youdaoicibaDictYouDict
"tend or care for; curry and feed," 1809, from groom (n.1) in its secondary sense of "male servant who attends to horses." Transferred sense of "to tidy (oneself) up" is from 1843; figurative sense of "to prepare a candidate" is from 1887, originally in U.S. politics. Related: Groomed; grooming.
groomsman (n.)youdaoicibaDictYouDict
attendant on a bridegroom at a wedding, 1690s, from possessive of groom (n.2) + man (n.).
groove (n.)youdaoicibaDictYouDict
c. 1400, "cave; mine; pit dug in the earth" (late 13c. in place names), from a Scandinavian source such as Old Norse grod "pit," or from Middle Dutch groeve "furrow, ditch" (Modern Dutch groef), both from Proto-Germanic *grobo (cognates: Old Norse grof "brook, river bed," Old High German gruoba "ditch," German Grube "a pit, hole, ditch, grave," Gothic groba "pit, cave," Old English græf "ditch, grave"), from PIE root *ghrebh- (2) "to dig, bury, scratch" (see grave (n.)). Sense of "long, narrow channel or furrow," especially as cut by a tool, is 1650s. Meaning "spiral cut in a phonograph record" is from 1902. Figurative sense of "routine" is from 1842, often deprecatory at first, "a rut."
groove (v.)youdaoicibaDictYouDict
1680s, "make a groove, cut a channel in," from groove (n.). Slang sense is from 1930s (see groovy). Related: Grooved; grooving.
groovy (adj.)youdaoicibaDictYouDict
1850, "pertaining to a groove," from groove (n.) + -y (2). Slang sense of "first-rate, excellent" is 1937, American English, from jazz slang phrase in the groove (1932) "performing well (without grandstanding)." As teen slang for "wonderful," it dates from c. 1941; popularized 1960s, out of currency by 1980. Earlier colloquial figurative sense was "having a tendency to routine, inclined to a specialized and narrow way of life or thought" (1882). Related: Grooviness.
grope (v.)youdaoicibaDictYouDict
late Old English grapian "to feel about (as one blind or in darkness)," also "take hold of, seize, touch, attain," related to gripan "grasp at" (see gripe (v.)). Transitive sense "search out by sense of touch alone" was in late Old English. Figurative sense is from early 14c. Indecent sense "touch (someone) amorously, play with, fondle" (marked as "obsolete" in OED 2nd edition) is from c. 1200. Related: Groped; groping.
grope (n.)youdaoicibaDictYouDict
c. 1500, "act of groping," from grope (v.). Old English had grap "a grasp."
grosbeak (n.)youdaoicibaDictYouDict
general name for a bird with a large bill, 1670s, partial translation of French grosbec; see gross (adj.) + beak.
groschen (n.)youdaoicibaDictYouDict
1610s, small silver coin formerly used in Germany and Austria, from German groschen, altered from Czech groš, name of a coin (about one-thirtieth of a thaler), from Medieval Latin (denarius) grossus, literally "a thick coin," from Latin grossus "thick" (see gross (adj.), and compare groat).
gross (adj.)youdaoicibaDictYouDict
mid-14c., "large;" early 15c., "thick," also "coarse, plain, simple," from Old French gros "big, thick, fat; tall; strong, powerful; pregnant; coarse, rude, awkward; ominous, important; arrogant" (11c.), from Late Latin grossus "thick, coarse" (of food or mind), in Medieval Latin "great, big" (source also of Spanish grueso, Italian grosso), a word of obscure origin, not in classical Latin. Said to be unrelated to Latin crassus, which meant the same thing, or to German gross "large," but said by Klein to be cognate with Old Irish bres, Middle Irish bras "big."

Its meaning forked in English. Via the notion of "coarse in texture or quality" came the senses "not sensitive, dull stupid" (1520s), "vulgar, coarse in a moral sense" (1530s). Via notion of "general, not in detail" came the sense "entire, total, whole, without deductions" (early 15c.), as in gross national product (1947). Meaning "glaring, flagrant, monstrous" is from 1580s; modern meaning "disgusting" is first recorded 1958 in U.S. student slang, from earlier use as an intensifier of unpleasant things (gross stupidity, etc.).
gross (n.)youdaoicibaDictYouDict
"a dozen dozen," early 15c., from Old French grosse douzaine "large dozen;" see gross (adj.). Earlier as the name of a measure of weight equal to one-eighth of a dram (early 15c.). Sense of "total profit" (opposed to net (adj.)) is from 1520s.
gross (v.)youdaoicibaDictYouDict
"to earn a total of," 1884, from gross (adj.) in the "whole, total" sense. Slang meaning "make (someone) disgusted" (usually with out) is from 1971. Related: Grossed; grossing.
grossly (adv.)youdaoicibaDictYouDict
1520s, "plainly, obviously," from gross (adj.) + -ly (2). Meaning "coarsely, shamefully" is from 1540s; that of "excessively" is from 1610s.
grossness (n.)youdaoicibaDictYouDict
early 15c., "size," from gross (adj.) + -ness. Meaning "state of being indelicate, rude, or vulgar" is from 1680s.
grot (n.)youdaoicibaDictYouDict
short for grotto, c. 1500; perhaps from or influenced by French grotte.
grotesque (adj.)youdaoicibaDictYouDict
"wildly formed, of irregular proportions, boldly odd," c. 1600s, originally a noun (1560s), from Middle French crotesque (16c., Modern French grotesque), from Italian grottesco, literally "of a cave," from grotta (see grotto). The explanation that the word first was used of paintings found on the walls of Roman ruins revealed by excavation (Italian pittura grottesca) is "intrinsically plausible," according to OED. Originally merely fanciful and fantastic, the sense became pejorative, "clownishly absurd, uncouth," after mid-18c. As the British name for a style of square-cut, sans-serif letter, from 1875. Related: Grotesquely; grotesqueness.
grotto (n.)youdaoicibaDictYouDict
"picturesque cavern or cave," 1610s, from Italian grotta, earlier cropta, a corruption of Latin crypta "vault, cavern," from Greek krypte "hidden place" (see crypt). Terminal -o may be from its being spelled that way in many translations of Dante's "Divine Comedy."
grotty (n.)youdaoicibaDictYouDict
slang shortening of grotesque, it had a brief vogue 1964 as part of the argot popularized by The Beatles in "A Hard Day's Night." It unconsciously echoes Middle English groti "muddy, slimy," from Old English grotig "earthy," from grot "particle."