gnash your teeth idiom
（气得）咬牙切齿
to bring your teeth forcefully together when you are angry
The monster roared and gnashed its teeth. 那怪兽咆哮着，将牙磨得咯咯直响。
humorous抱怨，发牢骚
to complain angrily and noisily about something
New Yorkers gnashed their teeth about the governor's decision to raise property taxes. 纽约人纷纷抱怨政府提高地产税的决定。