close up clam up dummy up shut up belt up button up be quiet keep mum
close_up%2:32:00:: clam_up%2:32:00:: dummy_up%2:32:00:: shut_up%2:32:00:: belt_up%2:32:00:: button_up%2:32:00:: be_quiet%2:32:00:: keep_mum%2:32:00::
refuse to talk or stop talking; fall silent
The children shut up when their father approached