(figuratively, idiomatic) In jail, in prison.

(idiomatic, theater, film) behind the scenery and stage area; backstage; among the actors; during the production or rehearsal / (idiomatic, figuratively) In secret; out of public view.

Being or working out in secret or out of public view. / Divulging or reporting hidden workings.

Alternative form of stay-behind

Used other than figuratively or idiomatically: see stay, behind. / (idiomatic) To remain where one is, whilst others leave.

(Australian rules football) A behind (one-point score) made when the ball passes through the goal posts or behind posts not from the foot of the attacking team, i.e. either spilled off hands or deliberately carried through by the defenders.

In control of a vehicle; driving. / (idiomatic) In control of the situation; in charge.

(idiomatic, pharmacology, medicine) Of drugs, dispensed by a pharmacist without needing a doctor's prescription or other form of compliance.

(baseball, of a pitcher) Having fewer strikes than balls against a batter in an at-bat. / (baseball, of a batter) Having more strikes than balls against a pitcher in an at-bat.

(idiomatic, of a horse) Evading the bit.