PHRASE
（因憤怒等）咬牙切齒
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...
如果布萊思聽到那個消息，我保準他會氣得咬牙切齒。
If you couldn't attend either of the concerts and are currently gnashing your teeth at having missed out, don't despair...
如果這兩場音樂會你都未能參加并且正在為錯失機會而懊惱的話，別灰心。