Definition of “let sb off” - English Dictionary

british dictionary

“let sb off” in British English

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let sb off

phrasal verb with let uk /let/ us /let/ verb present participle letting, past tense and past participle let

B2 to not punish someone who has committed a crime or done something wrong, or to not punish them severely:

Instead of a prison sentence they were let off with a fine.
You won't be let off so lightly (= you will be punished more severely) the next time.

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(Definition of “let sb off” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)