anticlimax

英 [æntɪ'klaɪmæks] 美[,æntɪ'klaɪmæks]

• n. 突降法；虎头蛇尾；令人扫兴的结尾

1. a disappointing decline after ad previous rise;

"the anticlimax of a brilliant career"

2. a change from a serious subject to a disappointing one