Definition of anticlimax noun from the Oxford Advanced Learner's Dictionary

 

anticlimax

 noun
noun
BrE BrE//ˌæntiˈklaɪmæks//
 
; NAmE NAmE//ˌæntiˈklaɪmæks//
 
[countable, uncountable]
 
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a situation that is disappointing because it happens at the end of something that was much more exciting, or because it is not as exciting as you expected Travelling in Europe was something of an anticlimax after the years he'd spent in Africa. a sense/feeling of anticlimax compare climaxExtra examples I’m afraid the party itself felt like a total anticlimax after all the other celebrations. There was no hiding the sense of anticlimax, if not downright disappointment. Travelling in Europe was something of an anticlimax after the years he’d spent in Africa.
See the Oxford Advanced American Dictionary entry: anticlimax