咬牙的英文：
brygmus
odontoprisis

To gnash the teeth and rub the palms.
咬牙擦掌。

Clench one's fist/jaws/teeth
攥紧拳头[咬紧牙关/咬牙

"However, be patient, grit your teeth a little longer
“总之，要有耐心，再咬咬牙，一定会绝处逢生。

I know this must be hard for you, but try to keep your chin up.
我知道这对你一定是有困难，但咬牙坚持住吧！

I know this must be hard for you, but try to keep your chin up.
我知道这对你一定是有困难，但咬牙坚持住吧！