keep your head
保持冷静或镇定，尤其在困难或紧张的情况下
口语·强调危急中冷静
英文释义
to remain calm and think clearly, especially in a difficult or stressful situation
例句
Even when the fire alarm went off, she managed to keep her head and lead everyone out safely.
典故来源
源自航海传统，船长在风暴中需保持头脑清醒才能指挥，后泛指镇定。