Please let him off.

请放他一马。

youdao

The teacher let him off the hook with a warning this time.

这一次老师放过他，只给了一个警告。

youdao

The policeman let him off with warnings not to cause trouble again.

警察再三警告他不要再惹是生非，然后将他放走。

youdao

So the one person who didn't we'll let him off for today.

没选α的人以后要注意了啊

耶鲁公开课 - 博弈论课程节选

This report doesn't let him off the hook, but it impales others alongside him.

BBC: Carrying on banking

Polygamy is legal in South Africa, and acceptable in his Zulu culture, but that doesn't let him off the hook in the comedy clubs.

WSJ: South Africa Gets Some Comic Relief

Anti-Thaksin groups suspect that General Surayud is seeking a deal with Mr Thaksin that would let him off with no more than a temporary ban from politics and some tax-dodging fines in return for not making trouble.

ECONOMIST: Now the hot season really begins