floss (n.)youdaoicibaDictYouDict[floss 词源字典]
"rough silk," 1759, of uncertain origin, perhaps from French floche "tuft of wool" (16c.), from Old French floc "tuft, lock," from Latin floccus "tuft of wool" (see flock (n.2)). Or from a dialectal survival of an unrecorded Old English or Old Norse word from the root of fleece (n.). Compare the surname Flossmonger, attested 1314, which might represent a direct borrowing from Scandinavian or Low German. In "The Mill on the Floss" the word is the proper name of a fictitious river in the English Midlands. Meaning "fine silk thread" is from 1871, short for floss silk (1759). Dental floss is from 1872; the verb floss in reference to use of it is from 1909. Related: Flossed; flossing.[floss etymology, floss origin, 英语词源]
flossy (adj.)youdaoicibaDictYouDict
"resembling floss," 1817, from floss (n.) + -y (2).
flotation (n.)youdaoicibaDictYouDict
1765, from float (v.) + -ation. Spelling influenced by French flotaison (compare floatation).
flotilla (n.)youdaoicibaDictYouDict
"a small fleet," 1711, from Spanish flotilla, diminutive of flota "a fleet," from flotar "to float," which is said to be from Old French floter "to float, set afloat," which is from a word in Frankish or some other Germanic language corresponding to Old English flood (n.). Compare Old Norse floti "raft; fleet." Sometimes also "a fleet of small ships."
flotsam (n.)youdaoicibaDictYouDict
c. 1600, from Anglo-French floteson, from Old French flotaison "a floating" (Modern French flottaison), from floter "to float, set afloat" (of Germanic origin; see flotilla) + -aison, from Latin -ation(em). Spelled flotsen in English till mid-19c. when it altered, perhaps under influence of many English words in -some. Folk-etymologized in dialect as floatsome.

In British law, flotsam are goods found floating on the sea as a consequence of a shipwreck or action of wind or waves; jetsam are things cast out of a ship in danger of being wrecked, and afterward washed ashore, or things cast ashore by the sailors. Whatever sinks is lagan. Flotsam and jetsam figuratively for "odds and ends" is attested by 1861.
flounce (v.)youdaoicibaDictYouDict
1540s, "to dash, plunge, flop," perhaps from Scandinavian (compare dialectal Swedish flunsa "to plunge," Norwegian flunsa "to hurry, work hurriedly," but first record of these is 200 years later than the English word), said to be of imitative origin. Spelling likely influenced by bounce. Notions of "anger, impatience" began to adhere to the word 18c. Related: Flounced; flouncing. As a noun from 1580s in reference to a sudden fling or turn of the body; by mid-18c. especially as expressing impatience or disdain.
flounce (n.)youdaoicibaDictYouDict
"deep ruffle on the skirt of a dress," 1713, from Middle English frounce "pleat, wrinkle, fold" (late 14c.), from Old French fronce "line, wrinkle; pucker, crease, fold," from Frankish *hrunkjan "to wrinkle," perhaps ultimately from the same Germanic source as shrink (v.). Influenced in form by flounce (v.). The verb meaning "arrange in flounces" is from 1711.
flounder (v.)youdaoicibaDictYouDict
"struggle awkwardly and impotently," especially when hampered somehow, 1590s, of uncertain origin, perhaps an alteration of founder (q.v.), influenced by Dutch flodderen "to flop about," or native verbs in fl- expressing clumsy motion. Figurative use is from 1680s. Related: Floundered; floundering. As a noun, "act of struggling," by 1867.
flounder (n.)youdaoicibaDictYouDict
"flatfish," c. 1300, from Anglo-French floundre, Old North French flondre, from Old Norse flydhra, from Proto-Germanic *flunthrjo (cognates: Middle Low German vlundere, Danish flynder, Old Swedish flundra "flatfish"), suffixed and nasalized form of PIE *plat- "to spread" (cognate: Greek platys "flat, wide, broad;" see plaice (n.)).
flour (n.)youdaoicibaDictYouDict
"finer portion of ground grain," mid-13c., from flower (n.), and maintaining its older spelling, on the notion of flour as the "finest part" of meal, perhaps as the flower is the finest part of the plant or the fairest plant of the field (compare French fleur de farine), as distinguished from the coarser parts (meal (n.2)). Old French flor also meant both "a flower, blossom" and "meal, fine flour." The English word also was spelled flower until flour became the accepted form c. 1830 to end confusion. Flour-knave "miller's helper" is from c. 1300.
flour (v.)youdaoicibaDictYouDict
"to sprinkle with flour," 1650s, from flour (n.). Meaning "convert (wheat) into flour" is from 1828. Related: Floured; flouring.
flourish (v.)youdaoicibaDictYouDict
c. 1300, "to blossom, grow" (intransitive), from Old French floriss-, stem of florir "to blossom, flower, bloom; prosper, flourish," from Latin florere "to bloom, blossom, flower," figuratively "to flourish, be prosperous," from flos "a flower" (see flora). Metaphoric sense of "thrive" is mid-14c. in English. Transitive meaning "brandish (a weapon), hold in the hand and wave about" is from late 14c. Related: Flourished; flourishing.
flourish (n.)youdaoicibaDictYouDict
c. 1500, "a blossom," from flourish (v.). Meaning "an ostentatious waving of a weapon" is from 1550s; that of "excessive literary or rhetorical embellishment" is from c. 1600; in reference to decorative curves in penmanship, 1650s; as "a fanfare of trumpets," 1590s.
flourishing (adj.)youdaoicibaDictYouDict
late 14c., "prospering, thriving;" c. 1400, "full of flowers," present participle adjective from flourish (v.). Related: Flourishingly.
flout (v.)youdaoicibaDictYouDict
"treat with disdain or contempt" (transitive), 1550s, intransitive sense "mock, jeer, scoff" is from 1570s; of uncertain origin; perhaps a special use of Middle English flowten "to play the flute" (compare Middle Dutch fluyten "to play the flute," also "to jeer"). Related: Flouted; flouting.
flow (v.)youdaoicibaDictYouDict
Old English flowan "to flow, stream, issue; become liquid, melt; abound, overflow" (class VII strong verb; past tense fleow, past participle flowen), from Proto-Germanic *flowan "to flow" (cognates: Middle Dutch vloyen, Dutch vloeien, vloeijen "to flow," Old Norse floa "to deluge," Old High German flouwen "to rinse, wash"), probably from PIE *pleu- "flow, float" (see pluvial). The weak form predominated from 14c., but strong past participle flown is occasionally attested through 18c. Related: Flowed; flowing.
flow (n.)youdaoicibaDictYouDict
mid-15c., "action of flowing," from flow (v.). Meaning "amount that flows" is from 1807. Sense of "any strong, progressive movement comparable to the flow of a river" is from 1640s. Flow chart attested from 1920 (flow-sheet in same sense from 1912). To go with the flow is by 1977, apparently originally in skiing jargon.
Go with the flow, enjoy the forces, let ankles, knees, hips and waist move subtly to soak up potential disturbances of acceleration and deceleration. ["Ski" magazine, November 1980]
flower (n.)youdaoicibaDictYouDict
c. 1200, flour, also flur, flor, floer, floyer, flowre, "the blossom of a plant; a flowering plant," from Old French flor "flower, blossom; heyday, prime; fine flour; elite; innocence, virginity" (12c., Modern French fleur), from Latin florem (nominative flos) "flower" (source of Italian fiore, Spanish flor; compare flora).

From late 14c. in English as "blossoming time," also, figuratively, "prime of life, height of one's glory or prosperity, state of anything that may be likened to the flowering state of a plant." As "the best, the most excellent; the best of its class or kind; embodiment of an ideal," early 13c. (of persons, mid-13c. of things); for example flour of milk "cream" (early 14c.); especially "wheat meal after bran and other coarse elements have been removed, the best part of wheat" (mid-13c.). Modern spelling and full differentiation from flour (n.) is from late 14c.

In the "blossom of a plant" sense it ousted its Old English cognate blostm (see blossom (n.)). Also used from Middle English as a symbol of transitoriness (early 14c.); "a beautiful woman" (c. 1300); "virginity" (early 14c.). Flower-box is from 1818. Flower-arrangement is from 1873. Flower child "gentle hippie" is from 1967.
flower (v.)youdaoicibaDictYouDict
c. 1200, "be vigorous, prosper, thrive," from flower (n.). Of a plant or bud, "to blossom," c. 1300. Meaning "adorn or cover with flowers" is from 1570s. Related: Flowered; flowering.
flower-pot (n.)youdaoicibaDictYouDict
also flowerpot, 1590s, from flower (n.) + pot (n.1).