stop it verb 1exclamation 1forms 3 verb1 •Tells the listener to stop doing something, often an annoying but harmless activity aimed at the speaker. exclamation1 •(informal) Synonym of shut up (“I don't believe it! no way!”)You're giving me the whole summer off, and a pay raise effective immediately when I come back? Stop it! You're too good to me! formsstopped it · stopping it · stops it