给你颜色不要给我开染坊
[jĭ nĭ yán sè bù yào jĭ wŏ kāi răn fāng]
This is an idiom meaning don't offer someone a little bit of leeway or power, because they'll abuse it or take much more liberty than you intended. The phrase is commonly used to warn someone not to overstep boundaries given a certain degree of authority or tolerance.