What does "cover" mean?

In addition to the idioms beginning with cover, also see blow one's cover; break cover; judge a book by its cover; (cover a) multitude of sins; take cover; under cover.

See cover in WNW Idioms

break cover

to come out of protective shelter

cover up

  1. to cover entirely; envelop; wrap
  2. to keep blunders, crimes, etc. from being known

take cover

to seek protective shelter

under cover

in secrecy or concealment

See cover in American Heritage Dictionary 4 Idioms

cover (one's) ass

Vulgar Slang
To take measures to avoid being held responsible if something goes wrong.

cover (one's) tracks

To conceal traces so as to elude pursuers.

cover (the) ground

  1. To traverse a given distance with satisfying speed.
  2. To deal with or accomplish something in a certain manner: The history course covered a lot of ground in six weeks.

take cover

To seek concealment or protection, as from enemy fire.

under cover

  1. In an enclosure for mailing.
  2. Being hidden or protected, as by darkness.

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