Etymology
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deep-seated (adj.)

1741, "having its root far below the surface," hence "firmly implanted," from deep (adv.) + past participle of seat (v.). Figurative use is by 1847. Deep-rooted is from early 15c.

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eighty-six (v.)

slang for "eliminate," 1936, originated at lunch counters, a cook's word for "none" when asked for something not available, probably rhyming slang for nix.

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deep-sea (adj.)

"of or pertaining to the deeper parts of the ocean," 1620s, from deep (adj.) + sea.

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deep-set (adj.)

"set far downward or inward," originally of eyes, late 14c., from deep (adv.) + set (adj.).

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give-and-take (n.)

1769, originally in horse-racing, referring to races in which bigger horses were given more weight to carry, lighter ones less; from give (v.) + take (v.). General sense attested by 1778. Give and take had been paired in expressions involving mutual exchange from c. 1500. Give or take as an indication of approximation is from 1958.

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deep-freeze (n.)

registered trademark (U.S. Patent Office, 1941) of a type of refrigerator; used generically for "cold storage" since 1949.

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go-it-alone (adj.)

attested by 1953 (in reference to U.S. foreign policy proposals), from an American English verbal phrase attested by 1842 and meaning "do anything without assistance." Go it as colloquial for "to act" (especially in a determined or vigorous way) is from 1825; hence also American English go it blind (1842) in reference to something done without regard for consequences.

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know-it-all (n.)

"one deemed (over)full of information or correct answers," 1895, from verbal phrase; see know (v.). Earlier in the same sense was know-all (1862); and Mr. Know-All was a minor character in Bunyan's "The Holy War" (1682).

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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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