(one's) mask slips(redirected from one's mask slips)
(one's) mask slips
One's true personality, agenda, or motivation has been revealed, which stands in contrast to what was presented to other people. Her masked slipped for just a moment, and everyone could see the contempt she really held for her audience.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.