verb
to release or discharge, especially from a responsibility or obligation
preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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The judge decided to let off the defendant with a warning.
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I can't believe they let him off with just a slap on the wrist.
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The teacher let us off the hook for not doing our homework.
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I could tell she was upset, but I decided to let her off the hook and not press the issue further.