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

1.
保持鎮定, 不露聲色, 咬緊牙關
to remain brave and unemotional in a difficult or upsetting situation
:
•
Despite the bad news, she managed to keep a stiff upper lip.
儘管有壞消息,她還是設法保持鎮定。
•
The soldiers were told to keep a stiff upper lip during the difficult mission.
士兵們被告知在艱鉅的任務中要保持鎮定。