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English definition of “let sb down”

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let sb down

verb uk phrasal verb with let   /let/ ( present participle letting, past tense and past participle let) us  
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.
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(Definition of let sb down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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