under cover

under cover {adv.} or {adj. phr.}

Hidden; concealed.

The prisoners escaped under cover of darkness.

He kept his invention under cover until it was patented.

Compare: UNDER WRAPS.

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Source: A Dictionary of American Idioms

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cover-up

[cover-up] {n.}, {slang} A plan or excuse to escape blame or punishment; lie, alibi. * /When the men robbed the bank, their cover-up was to dress like policemen./ * /Joe's […] A Dictionary of American Idioms

cover up

[cover up] {v.}, {informal} 1. To hide something wrong or bad from attention. * /The spy covered up his picture-taking by pretending to be just a tourist./ * /A crooked […] A Dictionary of American Idioms

take cover

[take cover] {v. phr.} To seek shelter or protection. * /The rain began so suddenly that we had to take cover in a doorway./ A Dictionary of American Idioms

cover one's tracks

[cover one's tracks] or [cover up one's tracks] {v. phr.} 1. To hide and not leave anything, especially foot marks, to show where you have been, so that no one […] A Dictionary of American Idioms

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