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 all ready to tell him that the relationship was over when he greeted me with a big bunch of flowers - that took the wind out of my sails. 我已经准备好要告诉他我们分手吧，可他捧着一大束花向我迎来——这让我的心又软了下来。