大换血

Traditional (Taiwan): 大換血

dàhuànxiě ㄉㄚˋ ㄏㄨㄢˋ ㄒㄧㄝˇ

    • sweeping replacement of personnel in a team or organisation

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
big blood change
Meaning
A sweeping replacement of personnel, as in a team or organisation. Informal.

Sources