anticlimax
US /ˌæn.t̬iˈklaɪ.mæks/
UK /ˌæn.t̬iˈklaɪ.mæks/
1.
phản cao trào
an event or experience that causes disappointment because it is less exciting than was expected or because it happens immediately after a much more interesting or exciting event:
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When you really look forward to something it's often an anticlimax when it actually happens.