Etymology
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tourniquet (n.)

1690s, from French tourniquet "surgical tourniquet," also "turnstile" (16c.), diminutive of torner "to turn," from Old French torner (see turn (v.)).

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turnip (n.)

c. 1500, turnepe, probably from turn (from its shape, as though turned on a lathe) + Middle English nepe "turnip," from Old English næp, from Latin napus "turnip." The modern form of the word emerged late 18c.

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tourney (v.)

c. 1300, from Anglo-French turneier, Old French tornoier "to joust, tilt," literally "turn around," from Vulgar Latin *tornizare, from Latin tornare "to turn" (see turn (v.)). Related: Tourneying.

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tournedos (n.)

fillet of steak dish, 1877, from French, from tourner "to turn" (see turn (v.)) + dos "back." According to French etymologists, "so called because the dish is traditionally not placed on the table but is passed behind the backs of the guests" [OED]. But there are other theories.

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turnpike (n.)

early 15c., "spiked road barrier used for defense," from turn + pike (n.2) "shaft." Sense transferred to "horizontal cross of timber, turning on a vertical pin" (1540s), which were used to bar horses from foot roads. This led to the sense of "barrier to stop passage until a toll is paid" (1670s). Meaning "road with a toll gate" is from 1748, shortening of turnpike road (1745).

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detour (n.)

"a roundabout or circuitous way," 1738, from French détour, from Old French destor "side road, byway; evasion, excuse," from destorner "turn aside," from des- "aside" (see dis-) + tourner "to turn" (see turn (v.)). In 18c. usually figurative. Usually treated as a French word in English (with italics and the accent mark) until late 19c.

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overturn (v.)

early 13c., of a wheel, "to rotate, roll over," from over- + turn (v.). Attested from c. 1300 in general transitive sense "to throw over violently;" figurative meaning "to ruin, destroy" is from late 14c. Of judicial decisions, "to reverse," it is attested from 1826. Related: Overturned; overturning. Old English had oferweorpan "to overturn, overthrow."

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tour (n.)

c. 1300, "a turn, a shift on duty," from Old French tor, tourn, tourn "a turn, trick, round, circuit, circumference," from torner, tourner "to turn" (see turn (v.)). Sense of "a continued ramble or excursion" is from 1640s. Tour de France as a bicycle race is recorded in English from 1916 (Tour de France Cycliste), distinguished from a motorcar race of the same name. The Grand Tour, a journey through France, Germany, Switzerland, and Italy formerly was the finishing touch in the education of a gentleman.

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return (v.)

early 14c., returnen, "to come back, come or go back to a former position" (intransitive), from Old French retorner, retourner "turn back, turn round, return" (Modern French retourner), from re- "back" (see re-) + torner "to turn" (see turn (v.)). Also in part from Medieval Latin retornare, returnare.

The transitive sense of "report officially, give an official statement or account" (in answer to a writ or demand) is from early 15c.; "to send (someone or something) back" is by mid-15c.; that of "to turn back" is from c. 1500. Meaning "to give in repayment or recompense" is from 1590s; that of "give back, restore" is from c. 1600. Related: Returned; returning.

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contour (n.)
Origin and meaning of contour

"the outline of a figure," 1660s, a term in painting and sculpture, from French contour "circumference, outline," from Italian and Medieval Latin contornare "to go around," from assimilated form of Latin com-, here perhaps an intensive prefix (see com-), + tornare "to turn (on a lathe);" see turn (v.).

Application to topography is from 1769. Earlier the word was used to mean "bedspread, quilt" (early 15c.) in reference to its falling over the sides of the mattress. Contour line in geography is from 1844. Contour-chair, one designed to fit the curves of the body, is from 1949.

As a verb, "mark with contour lines; form to the contours of," 1871. Related: Contoured.  

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