雷打不散

léidǎbùsàn ㄌㄟˊ ㄉㄚˇ ㄅㄨˋ ㄙㄢˋ

    • able to withstand any test and hold together

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
thunder can't scatter it
Meaning
Able to withstand tests and keep going, as of a friendship or a team. Approving.

Sources