stiff upper lip
noun [ C usually singular ] uk/ˌstɪf ˌʌp.ə ˈlɪp/ us/ˌstɪf ˌʌp.ɚ ˈlɪp/
坚忍，刚毅，沉得住气
Someone who has a stiff upper lip does not show their feelings when they are upset
He was taught to keep a stiff upper lip, whatever happens. 他学会了无论发生什么事都要坚强。