Definition of let off phrasal verb from the Oxford Advanced Learner's Dictionary

  

let off

 phrasal verb
phrasal verb
 
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Phrasal Verbs

let somebody off (with something)

 
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 to not punish somebody for something they have done wrong, or to give them only a light punishment They let us off lightly. She was let off with a warning.

let somebody off something

 
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(British English) to allow somebody not to do something or not to go somewhere He let us off homework today.
to fire a gun or make a bomb, etc. explode The boys were letting off fireworks.
See the Oxford Advanced American Dictionary entry: let off