Keep your mouth shut Definition 1 of 2Pro Tip 1/3Confidentiality Use when knowing sensitive info that shouldn’t be shared. I knew about the surprise party but had to keep my mouth shut. Pro Tip 2/3Peer Pressure Can imply resisting the urge to share gossip or secrets. Everyone else was talking, but I kept my mouth shut about the rumors. Pro Tip 3/3Consequence Hint Might suggest potential negative outcomes if you speak. He hinted that I should keep my mouth shut about the deal.