grit your teeth idiom
（常指因愤怒而）咬牙切齿
to press your top and bottom teeth together, often in anger
He gritted his teeth in silent fury. 他气得咬牙切齿，一言不发。
C2 咬紧牙关，下定决心（去应付棘手的局面）
to accept a difficult situation and deal with it in a determined way
We had to grit our teeth and agree with their conditions because we wanted the contract. 因为我们想要拿到那份合同，就必须咬牙答应他们的条件。