1. (verb)close up, close, fold, shut down, close down cease to operate or cause to cease operating Synonyms: block, come together, pen up, belt up, shut, button up, fill up, impede, conclude, be quiet, dummy up, clam up, close up, keep mum, close, close down, obstruct, fold, obturate, turn up, shut down, fold up, shut up, jam, occlude