belt up
Verb
Meaning
refuse to talk or stop talking; fall silent
Source: WordNetSynonyms
shut up
close up
clam up
be quiet
button up
dummy up
hush
shush
pipe down
dry up
keep quiet
keep mum
put a sock in it
Shut It
buckle up
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Antonyms
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My belt holds my pants up, but the belt loops hold my belt up. I don't really know what's happening down there. Who is the real hero?
The children shut up when their father approached