expression, ichidan verb
leave the room
A straightforward phrase meaning to exit a room. 室 is a somewhat formal or written word for 'room'; in casual speech, 部屋を出る is more common.
彼は静かに室を出た。
He quietly left the room.
More common and casual way to say 'leave the room'. 室 is more formal or literary.
Compound of 室 (shitsu, 'room') + を (wo, object marker) + 出る (deru, 'to leave').