PHRASE
（因愤怒等）咬牙切齿
If you say that someone is gnashing their teeth, you mean they are angry or frustrated about something.
例句
If Blythe heard that piece, I bet he was gnashing his teeth...
如果布莱思听到那个消息，我保准他会气得咬牙切齿。
If you couldn't attend either of the concerts and are currently gnashing your teeth at having missed out, don't despair...
如果这两场音乐会你都未能参加并且正在为错失机会而懊恼的话，别灰心。