拿柳条当棒槌

Traditional (Taiwan): 拿柳條當棒槌

náliǔtiáodàngbàngchui ㄋㄚˊ ㄌㄧㄡˇ ㄊㄧㄠˊ ㄉㄤˋ ㄅㄤˋ ˙ㄔㄨㄟ

    • to treat something light as weighty
    • to mistake the fake for the real

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
take a willow twig for a club
Meaning
To treat something light as weighty, or to mistake the fake for the real.

Sources