Etymology
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lift-off (adj.)
"removable by lifting," 1907, from the verbal phrase, from lift (v.) + off (adv.)
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off-base (adv.)

"unawares," by 1936, American English, from off (adv.) + base (n.); a figurative extension from baseball sense of a runner being "not in the right position" (1882) and vulnerable to being picked off.

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off-hand (adv.)

also offhand, 1690s, "at once, straightway," from off (prep.) + hand (n.). Probably originally in reference to shooting "from the hand," without a rest or support. Hence, of speech or action, "without deliberation, unpremeditated" (1719). Related: Off-handed; off-handedly.

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off-limits (adj.)

"forbidden, outside the limits within which a particular group or person must remain," by 1881, U.S. military academies jargon, from off (prep.) + limit (n.). Earlier (1857) it was applied to cadets, etc., who were in violation of the limitations on their movement and behavior.

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off-line (adj.)

1926, of railroads, "not done on a railway;" 1950, in computing, "not controlled by or connected to a computer or network;" from off (prep.) + line (n.).

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off-season (n.)

1848, "a period when business is down," from off- (adj.) (see off (prep.)) + season (n.).

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off-white (n.)

"white with a tinge of gray or yellow;" as an adjective, "almost the same as white," 1927, from off (prep.) + white (n.).

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do-it-yourself (adj.)

as a modifier, attested by 1941. The expression is much older (1610s). Related: Do-it-yourselfer.

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off-color (adj.)

1858, "defective or inferior because not of a natural or proper color," from off (prep.) + color (n.); originally used of gems; figurative extension to "not of the proper character, of questionable taste, risqué" is American English, 1867.

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off-key (adv.)

by 1911, of music or singing, "not having the correct tone or pitch, out of tune," from off (prep.) + musical sense of key (n.1). Figurative sense "not in accordance with what is appropriate in the circumstances" is by 1943.

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