keep a stiff upper lip
US /kiːp ə stɪf ˈʌpər lɪp/
UK /kiːp ə stɪf ˈʌpər lɪp/

1.
mantener la compostura, no mostrar emociones, aguantar el tipo
to remain brave and unemotional in a difficult or upsetting situation
:
•
Despite the bad news, she managed to keep a stiff upper lip.
A pesar de las malas noticias, logró mantener la compostura.
•
The soldiers were told to keep a stiff upper lip during the difficult mission.
Se les dijo a los soldados que mantuvieran la compostura durante la difícil misión.