杞人憂天 (gei2 jan4 jau1 tin1) — entertain imaginary or groundless fears (like the man of Qi who was haunted by the fear that the sky might fall) in Cantonese
geiˊ²杞janˎ₄人jauˉ¹憂tinˉ¹天简 杞人忧天
Mandarin Pinyin: qi3 ren2 you1 tian1
Meaning of 杞人憂天
nounentertain imaginary or groundless fears (like the man of Qi who was haunted by the fear that the sky might fall)