laugh on the other side of (one's) face
To experience a drastic change in one's emotions, often in a short span of time. A: "I thought your mother was happy that we're getting married." B: "Me too, but now she's laughing on the other side of her face, and I get an angry phone call from her every day."
laugh on the other side of your face
be discomfited after feeling satisfaction or confidence about something. A North American variant of this expression is laugh out of the other side of your mouth .
laugh on the other side of your ˈface
(British English, informal) be forced to change from feeling pleased or satisfied to feeling disappointed or annoyed: If you think you’ve tricked me, then you’re wrong! You’ll soon be laughing on the other side of your face!