反咬一口

fǎnyǎoyīkǒu ㄈㄢˇ ㄧㄠˇ ㄧ ㄎㄡˇ

    • to make a false countercharge

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
turn around and bite back
Meaning
To accuse the person who exposed or accused you, when you are the one in the wrong. Critical; like 'turn the tables with false accusations'.

Sources