wipe the smile off someone's face
US /waɪp ðə smaɪl ɔf ˈsʌm.wʌnz feɪs/
UK /waɪp ðə smaɪl ɔf ˈsʌm.wʌnz feɪs/

1.
顔から笑顔を消し去る, 得意顔をくじく
to make someone stop feeling happy or confident, often by doing something unpleasant or by revealing an unpleasant truth
:
•
Winning the championship will really wipe the smile off their face.
チャンピオンシップに勝てば、本当に彼らの顔から笑顔を消し去るだろう。
•
The bad news quickly wiped the smile off her face.
その悪い知らせはすぐに彼女の顔から笑顔を消し去った。