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English definition of “let sb down”

let sb down

phrasal verb with let     /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.Disappointing yourself and others
(Definition of let sb down from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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