hush up is a verb meaning "cover up a misdemeanor, fault, or error". It carries 2 recorded senses.
cover up a misdemeanor, fault, or error
“Let's not whitewash the crimes of Stalin”
“She tried to gloss over her mistakes”
Definitions, synonyms and semantic relations for hush up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.