杞人忧天

qǐrén-yōutiān

(1) [like the man of Qi who was haunted by the fear that the sky might fall]∶《列子·天瑞》: "杞国有人忧天地崩坠, 身亡所寄, 废寝食者"。 传说杞国有个人怕天塌下来, 愁得寝食不安

(2) [with unwarranted anxiety]∶比喻不必要的忧虑