1 fabric that covers a window
VERB + CURTAIN close, draw, open, pull (across/aside/back/closed) They sat in the dark with the curtains drawn. She pulled back the curtains, and sunlight streamed in.
CURTAIN + VERB hang Heavy red velvet curtains hung either side of the huge window. | billow The curtains billowed madly as the wind caught them.
PREP. behind a/the ~ He took a bag from a shelf behind some curtains.
2 in a theatre
CURTAIN + VERB go up, open, part, rise | close, come down, fall At the end of the play the curtain came down to tremendous applause.