in | Search Online Etymology Dictionary

"without restrictions," 1890, from the adverbial phrase; see all + in (adv.).

also inhouse, 1955, from in (prep.) + house (n.).

also instore, 1954, from in (prep.) + store (n.). In Middle English, instore was a verb meaning "to restore, renew," from Latin instaurare.

tie-in (n.)

"connection," 1934, from verbal phrase (attested by 1793), from tie (v.) + in (adv.).

shoo-in (n.)

"easy winner" (especially in politics), 1939, from earlier sense "horse that wins a race by pre-arrangement" (1928); the verb phrase shoo in in this sense is from 1908; from shoo (v.) + in (adv.).

shut-in (n.)

"person confined from normal social intercourse," 1904, from the verbal phrase, from shut (v.) + in (adv.).

in-country (n.)

"interior regions" of a land, 1560s, from in (prep.) + country.

be-in (n.)

"a public gathering of hippies" [OED], 1967, from be + in (adv.).

in-migration (n.)

1942, American English, in reference to movement within the same country (as distinguished from immigration), from in (prep.) + migration.

in-service (adj.)

also inservice, 1928, from in (prep.) + service (n.).

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