不敢越雷池一步 [－－－－－－－]

Jyutping bat1 gam2 jyut6 leoi4 ci4 jat1 bou6
Pinyin bù gǎn yuè léi chí yī bù

Definitions (CC-CEDICT)
  1. dare not go one step beyond the prescribed limit
Definitions (Wiktionary)
  1. phrase, idiomatic
    to dare not go one step beyond the limit; to stay strictly within bounds