不分青红皂白

不分青红皂白:

Literally means:

not distinguish blue, black and white

Actually means:

皂 means black. 青 (blue) and 红 (red), 皂 (black) and 白 (white) are two groups of colors in which one contracts another one.

It means truth and false, rationality and irrationality. This phrase means that someone handles things in a casual way without figuring out the cause and the situation or cannot distinguish the truth and the false. Derogatory.

皂，黑色。青和红，皂和白是两组差别很大的颜色，比喻正确和错误，有理和无理。

不分青红皂白，比喻不弄清原因或情况，不区分对的和错的，就随便处理事情。具有贬义色彩。