take the wind out of sails
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take the wind out of someone's sails
Fig. to challenge someone's boasting or arrogance. John was bragging about how much money he earned until he learned that most of us make more. That took the wind out of his sails. Learning that one has been totally wrong about something can really take the wind out of one's sails.
take the wind out of (one's) sails
To rob of an advantage; deflate.