In prison, in confinement. Also: in hospital; (of a car) in a garage for maintenance or repair.

in (occasionally the) hock: (a) in the act (of gambling); (b) in prison; (c) in pawn; (d) in debt. So occasionally out of hock.

slang (chiefly U.S.). Held in custody or detention; in prison; chiefly in to put on ice and variants: to hold in custody or detention; to place in…

U.S. slang. In prison.