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doublet (n.)[doublet 词源字典]: early 14c. as a type of men's garment, from Old French doublet (12c.), from diminutive of duble (see double (adj.)). From 1550s as "one of two things that are alike."[doublet etymology, doublet origin, 英语词源]
doublethink (n.): 1948, coined by Orwell in "Nineteen Eighty-Four," from double (adj.) + think.
doubloon (n.): 1620s, from French doublon (16c.) and directly from Spanish doblon a gold coin, augmentative of doble "double" (coin so called because it was worth twice as much as the Spanish gold pistole), from Latin duplus "double" (see double (adj.)). Also see -oon.
doubly (adv.): late 14c., from double (adj.) + -ly (2).
doubt (v.): early 13c., "to dread, fear," from Old French doter "doubt, be doubtful; be afraid," from Latin dubitare "to doubt, question, hesitate, waver in opinion" (related to dubius "uncertain;" see dubious), originally "to have to choose between two things."

The sense of "fear" developed in Old French and was passed on to English. Meaning "to be uncertain" is attested in English from c. 1300. The -b- was restored 14c. by scribes in imitation of Latin. Replaced Old English tweogan (noun twynung), from tweon "two," on notion of "of two minds" or the choice of two implied in Latin dubitare (compare German Zweifel "doubt," from zwei "two").
doubt (n.): early 13c., from Old French dote (11c.) "fear, dread; doubt," from doter (see doubt (v.)).
doubtful (adj.): late 14c., from doubt (n.) + -ful. Related: Doubtfully; doubtfulness.
doubtless: mid-14c. (adv.), mid-15c. (adj.), from doubt (n.) + -less. Related: Doubtlessly.
douche (n.): 1766, "jet of water," from French douche (16c.), from Italian doccia "shower," from docciare "to spray," from Latin ductionem "a leading," from ducere "to lead" (see duke (n.)). Meaning "vaginal cleansing" is from 1833. The verb is first attested 1838. Related: Douched; douching.
douchebag (n.): also douche-bag, douche bag, 1893, from douche + bag (n.). American English slang sense of "contemptible person" attested by 1967.
dough (n.): Old English dag "dough," from Proto-Germanic *daigaz "something kneaded" (cognates: Old Norse deig, Swedish deg, Middle Dutch deech, Dutch deeg, Old High German teic, German Teig, Gothic daigs "dough"), from PIE *dheigh- "to build, to form, to knead" (cognates: Sanskrit dehah "body," literally "that which is formed," dih- "to besmear;" Greek teikhos "wall;" Latin fingere "to form, fashion," figura "a shape, form, figure;" Gothic deigan "to smear;" Old Irish digen "firm, solid," originally "kneaded into a compact mass"). Meaning "money" is from 1851.
doughboy (n.): "U.S. soldier," 1864, American English, said to have been in oral use from 1854, or from the Mexican-American War (1847), it is perhaps from resemblance of big buttons on old uniforms to a sort of biscuit of that name (1680s), but there are various other conjectures.
doughface (n.): contemptuous nickname in U.S. politics for Northern Democrats who worked in the interest of the South before the Civil War; it was taken to mean "man who allows himself to be moulded." The source is an 1820 speech by John Randolph of Roanoke, in the wake of the Missouri Compromise.
Randolph, mocking the northerners intimidated by the South, referred to a children's game in which the players daubed their faces with dough and then looked in a mirror and scared themselves. [Daniel Walker Howe, "What Hath God Wrought," 2007]
Mask of dough is recorded from 1809, and the same image Randolph used is attested in another context by 1833. In contemporary use the expression was explained as referring to "the pale doughy faces of his frightened opponents" [Craigie] or "to liken them in timidity to female deer," which is frightened at her own shadow.
doughnut (n.): 1809, American English, from dough + nut (n.), probably on the notion of being a small round lump (the holes came later, first mentioned c. 1861). First recorded by Washington Irving, who described them as "balls of sweetened dough, fried in hog's fat, and called doughnuts, or olykoeks." Earlier name for it was dough-boy (1680s). Bartlett (1848) meanwhile lists doughnuts and crullers among the types of olycokes, a word he derives from Dutch olikoek, literally "oil-cake," to indicate a cake fried in lard.
The ladies of Augusta, Maine, set in operation and carried out a novel idea, namely, the distribution of over fifty bushels of doughnuts to the Third volunteer regiment of that State. A procession of ladies, headed by music, passed between double lines of troops, who presented arms, and were afterwards drawn up in hollow square to receive from tender and gracious hands the welcome doughnation. [Frazar Kirkland, "Anecdotes of the Rebellion," 1866]
Meaning "a driving in tight circles" is U.S. slang, 1981. Compare also donut.
doughty (adj.): Old English dohtig "competent, good, valiant," from dyhtig "strong," related to dugan "to be fit, be able, be strong," and influenced by its past participle, dohte.

All from Proto-Germanic *duhtiz- (cognates: Middle High German tühtec, German tüchtig, Middle Dutch duchtich), from PIE *dheugh- "to be fit, be of use, proper" (cognates: German Tugend "virtue," Greek teukhein "to make ready," Irish dual "becoming, fit," Russian dužij "strong, robust"). Rare after 17c.; in deliberately archaic or mock-heroic use since c. 1800. If it had survived, its modern form would be dighty.
Douglas: family name (late 12c.), later masc. personal name, from Gaelic Dubh glas "the dark water," name of a place in Lanarkshire. As a given name, in the top 40 for boys born in U.S. from 1942 to 1971. Douglas fir named for David Douglas (1798-1834), Scottish botanist who first recorded it in Pacific Northwest, 1825. Douglas scheme, Douglas plan, Douglassite, etc. refer to "social credit" economic model put forth by British engineer Maj. Clifford Hugh Douglas (1879-1952).
doula (n.): by 1980, from Greek doulos (fem. doule) "slave."
dour (adj.): mid-14c., "severe," from Scottish and northern England dialect, probably from Latin durus "hard" (see endure); sense of "gloomy, sullen" is late 15c.
douse (v.): 1550s, "to strike, punch," which is perhaps from Middle Dutch dossen "beat forcefully" or a similar Low German word.

Meaning "to strike a sail in haste" is recorded from 1620s; that of "to extinguish (a light)" is from 1785; perhaps influenced by dout (1520s), an obsolete contraction of do out (compare doff, don). OED regards the meaning "to plunge into water, to throw water over" (c. 1600) as a separate word, of unknown origin, though admitting there may be a connection of some sort. Related: Doused; dousing.
dove (n.): probably from Old English dufe- (found only in compounds), from Proto-Germanic *dubon (cognates: Old Saxon duba, Old Norse dufa, Swedish duva, Middle Dutch duve, Dutch duif, Old High German tuba, German Taube, Gothic -dubo), perhaps related to words for "dive," in reference to its flight.

Originally applied to all pigeons, now mostly restricted to the turtle dove. A symbol of gentleness from early Christian times, also of the Holy Spirit (as in Gen. viii:8-12), and of peace and deliverance from anxiety; political meaning "person who advocates peace" attested by 1917, from the Christian dove of peace.