一次起兩次止 (jat1 ci3 hei2 loeng5 ci3 zi2) — just this once; may be done once but never again [written and colloquial] in Cantonese
jatˉ¹一ci˗₃次heiˊ²起loengˏ₅兩ci˗₃次ziˊ²止简 一次起两次止
Mandarin Pinyin: yi1ci4 qi3 liang3 ci4 zhi3
Meaning of 一次起兩次止
nounjust this once; may be done once but never again [written and colloquial]