Meaning of “let sb down” in the English Dictionary

british dictionary

"let sb down" in British English

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let sb down

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

B2 to disappoint someone by failing to do what you agreed to do or were expected to do:

You will be there tomorrow - you won't let me down, will you?
When I was sent to prison, I really felt I had let my parents down.

More examples

  • I don't want to let myself down in the exam.
  • I let down all my friends by stealing.
  • I feel that I let down my country.
  • My children would never let me down.
  • I'm relying on your help - please don't let me down.

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