expression, godan verb (-su)
make someone lose face; embarrass someone; make someone look foolish
Idiomatic expression meaning to damage someone's reputation or dignity, often publicly. The subject causes the loss of face; the object is the person whose face is lost.
彼は会議で上司の顔を潰してしまった。
He made his boss lose face at the meeting.
そんなことを言ったら、彼
If you say something like that, you'll embarrass her.