noun
wings of a stage; side stage; coulisse
Refers to the area just offstage, hidden from the audience, where performers wait or stagehands work.
俳優は舞台袖で出番を待っている。
The actor is waiting in the wings for his cue.
舞台袖から舞台の様子をうかがう。
I peek at the stage from the wings.
袖 usually means 'sleeve', but in theater contexts it can refer to the wings of a stage.
Compound of 舞台 (stage) and 袖 (sleeve), metaphorically likening the offstage area to the sleeve of a garment.