Sharp, pointed rejoinder to one’s critic

verb

1. To respond quickly and sharply to criticism

   "A lot of times when someone says something nasty to you online, your gut reaction is to clap back right away. It's always good to take a cooling-off period—I recommend sleeping on it."

noun

1. A quick, sharp, and effective response to criticism

   "Not to be confused with a garden-variety diss, a clapback is deemed by most as a targeted, often viciously acute comeback intended to place someone in much-needed check."