take the wind out of one's sails

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.
Categories: wind {v. phr.}

'take the wind out of one's sails' on video