mask

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.
See also: mask, slip

mask out

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.
See also: mask, out
Farlex Dictionary of Idioms.

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.
See also: mask, out
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (one's) mask slips
  • (one's) (true) stripes
  • run out of steam
  • run out of steam, to
  • know where (one) is coming from
  • know where one is coming from
  • know where someone is coming from
  • be in (one's) DNA
  • (from) top to toe
  • recharge your batteries
References in classic literature
He began therefore to make a very warm answer to her last speech, when a mask, in the character of an old woman, joined them.
While Jones and his mask were walking together about the room, to rid themselves of the teazer, he observed his lady speak to several masks, with the same freedom of acquaintance as if they had been barefaced.
The sight of the masked man gave rise to a prolonged sensation.
You, also, stand aside," he said to the masked man.
"Perhaps!...Some day, perhaps!" she said, resuming her mask; and she went away, forbidding him, with a gesture, to follow her.
Christine entered, took off her mask with a weary movement and flung it on the table.
This ball was an exceptional affair, given some time before Shrovetide, in honor of the anniversary of the birth of a famous draftsman; and it was expected to be much gayer, noisier, more Bohemian than the ordinary masked ball.
"How unfortunate that you were masked, Albert," said Franz; "here was an opportunity of making up for past disappointments."
Two or three masks strove to knock his moccoletto out of his hand; but Albert, a first-rate pugilist, sent them rolling in the street, one after the other, and continued his course towards the church of San Giacomo.
The second masked person to whom the king had addressed himself was a man of huge stature and vast circumference.
Louis looked all round him; but by the light of the lamp which the masked figure raised for the purpose, he could perceive nothing but the damp walls which glistened here and there with the slimy traces of the snail.
Women were playing; they were masked, some of them; this license was allowed in these wild times of carnival.
But having been thus distinguished I could do no less than follow her with my eyes to the door where the chain of hands being broken all the masks were trying to get out at once.
"Also the Emperor became more and more excited with curiosity, and with great suspense one awaited the hour, when according to mask-law, each masked guest must make himself known.
If any real lynching's going to be done it will be done in the dark, Southern fashion; and when they come they'll bring their masks, and fetch a MAN along.