Definition of let-down noun from the Oxford Advanced Learner's Dictionary

 

let-down

 noun
noun
BrE
 
; NAmE
 
[countable, usually singular, uncountable](informal)
 
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something that is disappointing because it is not as good as you expected it to be synonym disappointment, anticlimax Afterwards there was just a feeling of let-down. The London exhibition was a bit of a let-down.