shove a cork in it
To stop talking and be quiet; to shut up. Usually used as an imperative. Shove a cork in it, you two! I don't want to hear any more arguing until we get to Grandma's house. I was just about to tell them about Janet's pregnancy, but I shoved a cork in it when she shot me an icy look. Oh, shove a cork in it! No one wants to hear your complaints anymore.