雷打不動 [－－－动]

Jyutping leoi4 daa2 bat1 dung6
Pinyin léi dǎ bù dòng

Definitions (CC-CEDICT)
  1. not shaken by thunder (idiom); the arrangements are unalterable
  2. to adhere rigidly to regulations
  3. will go ahead whatever happens (of an arrangement or plan)
Definitions (Wiktionary)
  1. phrase, idiomatic
    one's mind is made up, and cannot be changed
  2. phrase, idiomatic
    to rigidly adhere to an established arrangement, without any changes