放大炮

fàngdàpào ㄈㄤˋ ㄉㄚˋ ㄆㄠˋ

    • to talk big
    • to shoot one's mouth off

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
fire a big cannon
Meaning
To talk empty big words, or to speak in harsh, fiery terms. Critical or mocking.

Sources