dummy up

Meaning

1. To make a mock-up or prototype version of something, without some or all off its intended functionality.
2. To make a fake version of something; to make a counterfeit.
3. (informal) To suddenly stop talking; shut up; to keep a secret; to refuse to talk.

Synonyms

clam up

dummy

be quiet

close up

shut up

button up

keep mum

belt up

mock up

floor

model