换脑筋

Traditional (Taiwan): 換腦筋

huànnǎojīn ㄏㄨㄢˋ ㄋㄠˇ ㄐㄧㄣ

    • to change one's way of thinking
    • to update old ideas

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
change one's brain
Meaning
To change one's way of thinking and update old ideas. Often an urging to be less rigid.

Sources