laugh on the other side of one's face (or North American out of the other side of one's mouth)
Be discomfited after feeling satisfaction or confidence about something.And then laughed on the other side of his face when my answer turned out to be correct, ahem....- The right honourable gentleman opposite is a very naughty man, and he will laugh on the other side of his face when my ship comes in.
- I think that for some time now they have been laughing on the other side of their face.
See parent entry: laugh