To stop talking because what is going to be said is not needed or wanted. Often used as an imperative, especially when annoyed. Save it, sis—I'm sick of your constant criticism! A: "I swear, it wasn't me!" B: "Save it! The security camera caught you red-handed!" You can save it, because I don't believe a word you're saying.
Inf. Stop talking.; Shut up!; Tell it to me later. I've heard enough. Save it! Save it! You talk too much!
exclam. Be quiet! I don’t care what you think you have to say. Save it!