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 asstake steps to protect yourself.
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.