take the wind out of sails

take the wind out of someone's sails

to make someone feel less confident or less determined to do something, usually by saying or doing something that they are not expecting. I was going to tell him the relationship was over when he greeted me with a big bunch of flowers and it rather took the wind out of my sails.

See also: sail, take, wind

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take the wind out of your sails

to make you feel less confident or determined. I was really mad at him, but he greeted me with flowers, which immediately took the wind out of my sails.

Etymology: based on the literal meaning of take the wind out of someone's sails (= to slow down a competing boat by catching the wind in your own sails and preventing it from filling the other boat's sails)

See also: sail, take, wind