grit your teeth
US /ɡrɪt jʊər tiːθ/
UK /ɡrɪt jʊər tiːθ/

1.
cerrar os dentes, aguentar firme
to accept a difficult situation and deal with it in a determined way
:
•
I had to just grit my teeth and get through the last few miles of the marathon.
Eu tive que apenas cerrar os dentes e passar pelos últimos quilômetros da maratona.
•
She didn't like the job, but she decided to grit her teeth and finish it.
Ela não gostava do trabalho, mas decidiu cerrar os dentes e terminá-lo.