Etymology
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do-rag (n.)

by 1973 (said in DAS to date to 1960s), African-American vernacular, from hairdo + rag (n.1).

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modern (n.)

1580s, "person of the present time" (contrasted to ancient), from modern (adj.). From 1897 as "one who is up to date."

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s.a. 

"without date," an abbreviation of Latin sine anno "without a year," from sine "without" (see sans) + ablative of annus "year" (see annual (adj.)).

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jujube (n.)
late 14c., "date-like fruit from a tree found in Asia," from Old French jujube or Medieval Latin jujuba (plural), ill-formed medieval representatives of Late Latin zizyphum, from zizyphus, name of an Asiatic tree with datelike fruit, from Greek zizyphon, from Persian zayzafun. For consonant shift, compare jealous from zealous. The meaning "soft candy with date-like flavor" first recorded 1835.
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impersuadable (adj.)
1763, from assimilated form of in- (1) "not, opposite of" + persuadable. [Earliest date in OED 2nd ed. print is a typo.]
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predate (v.)

"to seek prey," 1974, a back-formation from predator, predation, etc. Related: Predated; predating. For the word that means "antedate; pre-exist," see pre-date.

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crankshaft (n.)

also crank-shaft, "shaft turned by a crank," 1803, from crank (v.) + shaft (n.). The basic form of the mechanism appears to date from Roman times.

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homophobic (adj.)
by 1971, from homo- (2) "homosexual" + -phobia + -ic. Related: Homophobe; homophobia (which word is said to date from 1969 in this context; earlier "fear of men," by 1908).
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spell-check (v.)
"to use a computer's spell checker application on a document," by 1985, from spell (v.) + check (v.1). The applications themselves date to the late 1970s. Related: Spell-checked; spell-checking.
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jack-knife (v.)
1776, "to stab," from jack-knife (n.). Intransitive meaning "to fold or bend" the body is said to date from the time of the American Civil War. The truck accident verbal sense is from 1949. Related: Jackknifed; jackknifing.
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