cover someone's ass

Meanings:

• 1.

  Generalinformalvulgarslang
  • To protect someone from blame, criticism, or legal consequences by concealing information, lying, or providing excuses.
  • To take actions intended to prevent another person from being held accountable for wrongdoing or error.

• 2.

  Generalinformalslang
  • To protect oneself from criticism or liability by taking precautionary measures, documenting decisions, or creating an alibi.
  • To act defensively to avoid personal blame or disciplinary action.