TAKE THE WIND OUT OF ONE'S SAILS

{v. phr.} To surprise someone by doing better or by catching him in an error. * /John came home boasting about the fish he had caught; it took the wind out of his sails when he found his little sister had caught a bigger one./ * /Dick took the wind out of Bob's sails by showing him where he was wrong./ Compare: TAKE THE STARCH OUT OF(2).