stiff as a board

(informal)(of a person or part of the body) extremely stiff

(非正式)（人或身體某部位）非常僵硬的

a stiff upper lip

a quality of uncomplaining stoicism

堅定沉著，感情不外露，堅忍

senior managers had to keep a stiff upper lip and remain optimistic.

高級經理們要能夠堅定沉著，始終保持樂觀。