- 咬紧牙关 [yǎo jǐn yá guān]
- clench one's teeth; be determined; endure; endure with dogged will; grit one's teeth; keep a stiff upper lip; with set teeth
The snow was blowing in her face, but she gritted her teeth and went on.
When things get difficult, you just have to grit your teeth and persevere.
He clenched his teeth and refused to tell anything.