打小報告

Simplified: 打小报告

dǎxiǎobàogào ㄉㄚˇ ㄒㄧㄠˇ ㄅㄠˋ ㄍㄠˋ

    • to tattletale to rat on sb

      coll.

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
make a small report
Meaning
To tell on someone behind their back to a superior. Critical. Close to 'to snitch' or 'to tell tales'.

Sources