鬼算盘

Traditional (Taiwan): 鬼算盤

guǐsuànpan ㄍㄨㄟˇ ㄙㄨㄢˋ ˙ㄆㄢ

    • a scheme to harm others for one's own gain
    • a scheming mind

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
ghost abacus
Meaning
A scheme to harm others for one's own gain; also a calculating, scheming mind. Critical.

Sources