To be perfectly clear or obvious; crystal clear.
十分清楚、明白。
老舍《四世同堂》小顺儿样样事情都要闹个一清二楚，不然怎么能当好妈妈的保镖呢。”
After his explanation, the whole situation was yī qīng èr chǔ.
Learn the next connected idiom: 一清二楚 (yī qīng èr chǔ) → 楚楚动人 (chǔ chǔ dòng rén)
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