be quiet vs dummy up

be quiet and dummy up both are verbs.

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

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

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

be quiet (verb)	dummy up (verb)
refuse to talk or stop talking; fall silent	refuse to talk or stop talking; fall silent
	make a dummy of