dummy_up
1. [ verb ] make a dummy of; as of books or pages to be published
Synonyms: dummy
Related terms: produce
2. [ verb ] refuse to talk or stop talking; fall silent
Synonyms: shut_up be_quiet belt_up button_up clam_up keep_mum close_up
Examples:

"The children shut up when their father approached"

Related terms: open_up
Similar spelling:   dumpy