cut somebody down to size
cut (someone or something) down to size
1. To criticize one in an attempt to deflate their ego. A: "That guy always dominates the class discussion with his rambling, inane thoughts like he's some genius." B: "I know! It's time to cut him down to size."
2. To minimize the importance of something. We need to cut the board down to size before they continue their pattern of overreach.