sb's mask slips
If someone's mask slips, they do something that suddenly shows their real character, when they have been pretending to be a different, usually nicer, type of person.
Thesaurus: synonyms and related words
Faking & pretending
- a wolf in sheep's clothing idiom
- affect
- assume
- believe
- bluff
- changeling
- charlatan
- falsify
- feign
- fraud
- go through the motions idiom
- guise
- phoney
- play at sth
- play possum idiom
- play sth out
- play-acting
- professed
- purport
- quack
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