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Related to mask: Subnet mask
(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.
To hide, cover, or conceal something, either partially or in full. He thinks he can just mask out the smell in the bathroom with that horrible deodorant spray, but it just makes everything worse. We've planted trees around the perimeter of our property to mask it out from the neighbors.
throw off the mask
To discard some pretense or false display and begin acting in a genuine or authentic manner. It seems that many people have thrown off the mask of decency, whether they're protesting or responding to the protests. Jane, I implore you, throw off the mask and let the world see your true self!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mask something out
to conceal or cover part of something from view. The trees masked the city dump out, so it could not be seen from the street. The trees masked out the dump.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.