Etymology
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imprison (v.)

c. 1300, from Old French emprisoner "imprison; be in prison" (12c.), from assimilated form of in- "in" (from PIE root *en "in") + prison (see prison). Formerly also emprison. Related: Imprisoned; imprisoning.

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Definitions of imprison

imprison (v.)
lock up or confine, in or as in a jail;
The suspects were imprisoned without trial
Synonyms: incarcerate / lag / immure / put behind bars / jail / jug / gaol / put away / remand
imprison (v.)
confine as if in a prison; "His daughters are virtually imprisoned in their own house; he does not let them go out without a chaperone";
From wordnet.princeton.edu