gnash

He gnashed his teeth in his sleep.他曾在睡觉时磨牙。

His opponents have been gnashing their teeth in/with frustration [=they have been showing their frustration] since he won the election.自从他赢得选举以来，他的反对者们一直气得咬牙切齿。

His election has caused some weeping and gnashing of teeth among his opponents.他的当选让他的反对者们咬牙切齿。