To substitute for; to replace; (theater) to serve as an understudy. / To make one of a party in a bet or other speculation. / To take a side in a dispute.

A substitute; a replacement.

Alternative form of stand-to / To tolerate (something); to be able to withstand (something) stressful that will be ultimately beneficial.

(military) To assume such a state of readiness.

(military) A state of readiness assumed by ground troops at dawn and dusk in wartime.

Alternative form of stand-to

(idiomatic) To mean; to symbolize; to represent / To advocate, to support / To tolerate

(idiomatic, intransitive) To wait in expectation of some event; to be ready. / (idiomatic, transitive) To remain loyal or faithful to.

A person of similar size and shape to an actor who "stands in" for that actor during the lengthy process of setting up a shot, but who, unlike a double, does not appear in the film. / A substitute.

(idiomatic, transitive) To replace; to act as a double or substitute for.