一髮千鈞 (jat1 faat3 cin1 gwan1) — to hang by a thread; be in a precarious situation in Cantonese
jatˉ¹一faat˗₃髮cinˉ¹千gwanˉ¹鈞简 一发千钧
Mandarin Pinyin: yi1fa3 (TW) fa4 (PRC) qian1 jun1
Meaning of 一髮千鈞
nounto hang by a thread; be in a precarious situation
nounthousand unit of weight is hang on to one single hair, which describes the situation is very dangerous