1. refuse to talk or stop talking; fall silent - The children shut up when their father approached • Syn: close up, clam up, shut up, belt up, button up, be quiet, keep mum • Ant: open up (for: close up) • Verb Frames: - Somebody ----s 2. make a dummy of - dummy up the books that are to be published • Syn: dummy • Hypernyms: produce, make, create • Verb Frames: - Somebody ----s something