Result from Foreign Dictionaries (1 entries found)
From WordNet (r) 3.0 (2006) [wn]:
belt up
v 1: 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}]