不吐口

bùtǔkǒu ㄅㄨˋ ㄊㄨˇ ㄎㄡˇ

    • to refuse to state one's position
    • to withhold consent

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
not letting it out of the mouth
Meaning
Refusing to state one's position or give consent. Colloquial.

Sources