keep a stiff upper lip

To keep a stiff upper lip means to remain resolute and unemotional in the face of adversity or tragedy. Keeping a stiff upper lip is a phrase often used in relation to some sort of tragedy or dilemma, where one needs to remain courageous and not show any type of extreme emotion including fear, sadness or anxiety about the given situation. You remain completely resolute and like you have no emotions about the matter.