杞虑qǐ lǜ
(1) 《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
英
like the man of Qi who was haunted by the fear that the sky might fall
(2) 比喻不必要的忧虑
with unwarranted anxiety
⒈ 见“杞天之虑”。