bringdown n.,
slang,
informal 1. (from "bring down", past "brought down"). A critical or cutting remark said sarcastically in order to deflate a braggard's ego.
John always utters the right bringdown when he encounters a braggard. 2. A person who depresses and saddens others by being a chronic complainer.
John is a regular bringdown. [TahlilGaran] English Idioms Dictionary ▲