Curtain meaning : A piece of cloth covering a window, bed, etc. to offer privacy and keep out light. A similar piece of cloth that separates the audience and the stage in a theater. (by extension) The beginning of a show; the moment the curtain rises. (fortifications) The flat area of wall which connects two bastions or towers; the main area of a fortified wall. (also "final curtain") Death. That part of a wall of a building which is between two pavilions, towers, etc. A flag; an ensign. To cover (a window) with a curtain; to hang curtains. To hide, cover or separate as if by a curtain.