fuck (n.)youdaoicibaDictYouDict[fuck 词源字典]
1670s, "an act of sexual intercourse," from fuck (v.). From 1874 in coarse slang sense "a woman (considered in sexual terms);" from 1929 as something one doesn't give when one doesn't care. Flying fuck originally meant "sex had on horseback" and is first attested c. 1800 in broadside ballad "New Feats of Horsemanship."[fuck etymology, fuck origin, 英语词源]
fucker (n.)youdaoicibaDictYouDict
1590s, "one who copulates," agent noun from fuck (v.). By 1893 as a general term of abuse (or admiration).
DUCK F-CK-R. The man who has the care of the poultry on board a ſhip of war. ["Classical Dictionary of the Vulgar Tongue," 1796]
fucking (adj.)youdaoicibaDictYouDict
past participle adjective from fuck (v.). As a mere intensive, attested from 1893, probably older.
fucus (n.)youdaoicibaDictYouDict
algae genus, 1716, from Latin fucus, a type of reddish seaweed or rock-lichen, from or related to Greek phykos "seaweed," which is said to be of Semitic origin. From it was prepared in ancient times a red dye for woolen goods; hence in Greek and Latin it also had a sense "red paint" and was the general word for the article of women's make-up that supplied the place of rouge; and in Latin it was further extended to include "deceit, disguise." The custom is said to have originated among the Ionians, who were in close contact with Semitic peoples. The word was in Middle English as fuke, fuike "dissimulation" (mid-15c.); "red woolen cloth" (late 15c.); later fucus "a paint, dye," especially for the face, "rouge," also commonly used 17c. figuratively as "disguise, pretense." Hence also obsolete fucate "disguised, dissembling" (1530s), literally "colored, beautified with paint," from Latin fucatus "painted, painted, colored, disguised," past participle adjective from fucare, a verb derived from fucus.
fud (n.)youdaoicibaDictYouDict
"backside, buttocks," 1785, a Scottish and Northern dialect word of unknown origin; perhaps from Scandinavian.
fuddle (v.)youdaoicibaDictYouDict
1580s, "to get drunk" (intransitive); c. 1600, "to confuse as though with drink" (transitive), of obscure origin, perhaps from Low German fuddeln "work in a slovenly manner (as if drunk)," from fuddle "worthless cloth." The more common derivative befuddle dates only to 1873. Related: Fuddled; fuddling. A hard-drinker in 17c. might be called a fuddle-cap (1660s).
fuddy-duddy (n.)youdaoicibaDictYouDict
"old-fashioned person," 1871, American English, of uncertain origin.
fudge (n.2)youdaoicibaDictYouDict
"nonsense, rubbish," (1791), earlier and more usually as a contemptuous interjection, "lies! nonsense!" Probably a natural extension from fudge (v.) "put together clumsily or dishonestly," q.v. But Farmer suggests provincial French fuche, feuche, "an exclamation of contempt from Low German futsch = begone."
fudge (v.)youdaoicibaDictYouDict
"put together clumsily or dishonestly," by 1771 (perhaps from 17c.); perhaps an alteration of fadge "make suit, fit" (1570s), a verb of unknown origin. The verb fudge later had an especial association with sailors and log books. The traditional story of the origin of the interjection fudge "lies! nonsense!" (1766; see fudge (n.2)) traces it to a sailor's retort to anything considered lies or nonsense, from Captain Fudge, "who always brought home his owners a good cargo of lies" [Isaac Disraeli, 1791, citing a pamphlet from 1700]. It seems there really was a late 17c. Captain Fudge, called "Lying Fudge," and perhaps his name reinforced this form of fadge in the sense of "contrive without the necessary materials." The surname is from Fuche, a pet form of the masc. proper name Fulcher, from Germanic and meaning literally "people-army."
fudge (n.1)youdaoicibaDictYouDict
type of confection, 1895, American English, apparently a word first used among students at women's colleges; perhaps a special use from fudge (v.) or its noun derivative, via the notion of "insubstantial" or of something "faked-up" on the spot. The verb was used in school slang, and compare fudge (n.) "a made-up story" (1797).
'He lies,' answered Lord Etherington, 'so far as he pretends I know of such papers. I consider the whole story as froth -- foam, fudge, or whatever is most unsubstantial. ...' [Scott, "St. Ronan's Well," 1823]
fuel (n.)youdaoicibaDictYouDict
c. 1200, feuel, feul "fuel, material for burning," also figurative, from Old French foaille "fuel for heating," from Medieval Latin legal term focalia "right to demand material for making fire, right of cutting fuel," from classical Latin focalia "brushwood for fuel," from neuter plural of Latin focalis "pertaining to a hearth," from focus "hearth, fireplace" (see focus (n.)). Figurative use from 1570s. Of food, as fuel for the body, 1876. As "combustible liquid for an internal combustion engine" from 1886. A French derivative is fouailler "woodyard." Fuel-oil is from 1882.
fuel (v.)youdaoicibaDictYouDict
1590s, "feed or furnish with fuel," literal and figurative, from fuel (n.). Intransitive sense "to get fuel" (originally firewood) is from 1880. Related: Fueled; fueling.
fug (n.)youdaoicibaDictYouDict
"thick, close, stuffy atmosphere," 1888. "orig dial. & School slang" [OED].
fugacious (adj.)youdaoicibaDictYouDict
"fleeing, likely to flee," 1630s, with -ous + Latin fugaci-, stem of fugax "apt to flee, timid, shy," figuratively "transitory, fleeting," from fugere "to flee" (see fugitive). Related: Fugaciously; fugaciousness; fugacity.
fugal (adj.)youdaoicibaDictYouDict
1843, "pertaining to a fugue; in the style of a fugue," from fugue + -al (1).
fugitive (n.)youdaoicibaDictYouDict
late 14c., "one who flees, a runaway, a fugitive from justice, an outlaw," from fugitive (adj.). Old French fugitif also was used as a noun meaning "fugitive person," and Latin fugitivus (adj.) commonly also was used as a noun meaning "a runaway, fugitive slave, deserter."
fugitive (adj.)youdaoicibaDictYouDict
late 14c., "fleeing, having fled, having taken flight," from Old French fugitif, fuitif "absent, missing," from Latin fugitivus "fleeing," past participle adjective from stem of fugere "to flee, fly, take flight, run away; become a fugitive, leave the country, go into exile; pass quickly; vanish, disappear, perish; avoid, shun; escape the notice of, be unknown to," from PIE root *bheug- (1) "to flee" (cognates: Greek pheugein "to flee," Lithuanian bugstu "be frightened," bauginti "frighten someone," baugus "timid, nervous"). Old English had flyma.

Meaning "lasting but a short time, fleeting" is from c. 1500. Hence its use in literature for short compositions written for passing occasions or purposes (1766).
fugleman (n.)youdaoicibaDictYouDict
also fugelman, "expert soldier placed in front of a regiment or company in exercises as an example to the others," a mangled borrowing of German Flügelmann "leader of a file," literally "wing-man," from Flügel "wing" (related to fliegen "to fly;" see fly (v.1)) + Mann (see man (n.)).
fugly (adj.)youdaoicibaDictYouDict
by 1995, a contraction of fucking ugly. Perhaps with conscious echo of fugh an imitative expression of revulsion or abhorrence recorded from 1680s.
fugue (n.)youdaoicibaDictYouDict
type of musical composition, 1590s, fuge, from Italian fuga, literally "flight," also "ardor," from Latin fuga "a running away, act of fleeing," from fugere "to flee" (see fugitive (adj.)). Current English spelling (1660s) is from the French version of the Italian word.
A Fugue is a composition founded upon one subject, announced at first in one part alone, and subsequently imitated by all the other parts in turn, according to certain general principles to be hereafter explained. The name is derived from the Latin word fuga, a flight, from the idea that one part starts on its course alone, and that those which enter later are pursuing it. ["Fugue," Ebenezer Prout, 1891]