鬼心眼

guǐxīnyǎn ㄍㄨㄟˇ ㄒㄧㄣ ㄧㄢˇ

    • a bad or underhand idea
    • a sly, malicious scheme

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
ghost heart-and-eyes
Meaning
A bad or underhand idea; a sly, malicious scheme. Critical.

Sources