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What does "cop" mean?

cop a plea

☆
Slang to plead guilty to a criminal charge, esp. so as to get a lighter sentence

cop out

☆ Slang
  1. to confess to the police, often implicating another
    1. to go back (on a promise, commitment, etc.); back down; renege
    2. to give up; quit; surrender

See cop in American Heritage Dictionary 4 Idioms

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