Etymology
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all-in (adj.)
"without restrictions," 1890, from the adverbial phrase; see all + in (adv.).
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shut-in (n.)
"person confined from normal social intercourse," 1904, from the verbal phrase, from shut (v.) + in (adv.).
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tie-in (n.)
"connection," 1934, from verbal phrase (attested by 1793), from tie (v.) + in (adv.).
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in re (prep.)

"in the matter of, in the (legal) case of," c. 1600, probably from Duns Scotus; Latin, from re, ablative of res "property, goods; matter, thing, affair," from Proto-Italic *re-, from PIE *reh-i- "wealth, goods" (source also of Sanskrit rayi- "property, goods," Avestan raii-i- "wealth").

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in-gather (v.)
also ingather, 1570s, from in (adv.) + gather (v.). Related: Ingathered; ingathering (1530s).
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lead-in (n.)
1913, in electrical wiring, from verbal phrase; see lead (v.1) + in (adv.). General sense of "introduction, opening" is from 1928, originally in music.
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in-fighting (n.)
1816, in pugilism, the practice of getting at close quarters with an opponent; see in + fighting. Old English infiht (n.) meant "brawl within a house or between members of a household." Middle English had infight (v.) "to attack" (c. 1300); the modern verb infight "fight at close quarters" (1916) appears to be a back-formation from in-fighting. Related: In-fighter (1812).
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buy-in (n.)
"act of obtaining an interest in," 1970, from verbal phrase buy in "to purchase a commission or stock" (1826), from buy (v.) + in (adv.). To buy into "obtain an interest in by purchase" (as of stock shares) is recorded from 1680s.
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in-between (n.)
1815, "an interval;" also "a person who intervenes," noun use of prepositional phrase, from in (adv.) + between. Related: In-betweener (1912); in-betweenity (1927).
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in utero 
1713, Latin, literally "in the uterus," from ablative of uterus (see uterus).
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