換腦瓜子

Simplified: 换脑瓜子

huànnǎoguāzi ㄏㄨㄢˋ ㄋㄠˇ ㄍㄨㄚ ˙ㄗ

    • to change one's thinking
    • to take on new ideas

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
change one's head
Meaning
A more colloquial way of saying 换脑筋: to change one's thinking and take on new ideas.

Sources