Cover your ass
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cover (one's) ass
rude slang To act in order to avoid blame or responsibility for something or prevent oneself from experiencing negative consequences. I immediately covered my ass by saying that I wasn't home when the puppy got out. Politicians don't care about the outcome of the vote, they just care about covering their asses.
Cover your assand CYA
sent. & comp. abb. Do what is necessary to protect yourself from discovery or criticism. (Usually objectionable.) CYA when the shit hits the fan.