yǎo​yá

to make a hard decision

咬牙 yǎo//yá
to make a hard decision verb + noun
To steel oneself or make a painful resolution to persevere through difficulty

Gritting his teeth, he finally made his decision.

to clench one's teeth verb
To clench or gnash the teeth due to extreme anger or the endurance of great pain
to grind one's teeth
To grind one's teeth involuntarily while asleep.
shrewd
(Literary or dialect) To be overly shrewd, calculating, or difficult to deal with.
unyielding
To be strict or refuse to loosen one's grip; to hold fast to a demand

Frequency

Movie subtitles
0.510 per million appears in 0% of films
Written text
4.72 per million

Sources