懷鬼胎

Simplified: 怀鬼胎

huáiguǐtāi ㄏㄨㄞˊ ㄍㄨㄟˇ ㄊㄞ

    • to harbour a secret ulterior motive

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
carry a ghost foetus
Meaning
To harbour a secret, ulterior motive that one cannot reveal. Critical.

Sources