cover your ass
US /ˈkʌvər jʊər æs/
UK /ˈkʌvər jʊər æs/

1.
保護自己, 推卸責任
to protect oneself from being blamed or criticized, especially by taking precautions or making excuses
:
•
He always keeps detailed records to cover his ass in case of an audit.
他總是保留詳細記錄,以防審計時保護自己。
•
Make sure you get everything in writing to cover your ass.
確保所有事情都有書面記錄,以保護自己。