雷打不動

Simplified: 雷打不动

léidǎbùdòng ㄌㄟˊ ㄉㄚˇ ㄅㄨˋ ㄉㄨㄥˋ

    • not shaken by thunder (idiom) the arrangements are unalterable
    • to adhere rigidly to regulations
    • will go ahead whatever happens (of an arrangement or plan)

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
thunder can't move it
Meaning
Firm and unshakable whatever happens, as of a plan, habit or schedule. Approving or neutral.

Sources