be quiet vs button up

be quiet and button up both are verbs.

Word	Noun	Adjective	Verb	Adverb
be quiet	No	No	Yes	No
button up	No	No	Yes	No

As verbs, be quiet and button up are synonyms defined as:

Other synonyms of be quiet include belt up, clam up, close up, dummy up, keep mum, shut up.

be quiet (verb)	button up (verb)
refuse to talk or stop talking; fall silent	refuse to talk or stop talking; fall silent