'dummy up' definitions:

Definition of 'dummy up'

From: WordNet
verb
Make a dummy of; "dummy up the books that are to be published" [syn: dummy, dummy up]
verb
Refuse to talk or stop talking; fall silent; "The children shut up when their father approached" [syn: close up, clam up, dummy up, shut up, belt up, button up, be quiet, keep mum] [ant: open up]