cover for
US /ˈkʌvər fɔːr/
UK /ˈkʌvər fɔːr/

1.
代わりを務める, 代理をする
to do someone's work or duties while they are absent
:
•
Can you cover for me while I'm on vacation next week?
来週私が休暇中に代わりを務めてくれますか?
•
She asked her colleague to cover for her during her sick leave.
彼女は病気休暇中、同僚に代わりを務めてくれるよう頼んだ。
2.
隠す, かばう
to make excuses or provide an alibi for someone, especially to protect them from blame or punishment
:
•
He asked his friend to cover for him when he skipped class.
彼は授業をサボったとき、友達に言い訳をしてくれるよう頼んだ。
•
Don't try to cover for his mistakes; he needs to take responsibility.
彼の過ちを隠そうとしないでください。彼は責任を取る必要があります。