省油燈

Simplified: 省油灯

shěngyóudēng ㄕㄥˇ ㄧㄡˊ ㄉㄥ

    • well-behaved, easy-to-handle person
    • troublemaker

      negated

    • someone hard to handle

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
an oil-saving lamp
Meaning
A person who is well-behaved and easy to deal with. Mostly used negatively: '不是省油的灯' means a troublemaker or hard to handle.

Sources