排水
はいすい · haisui · JLPT N1 · noun
drain
排 — hand radical 扌 + 非 (fēi, phonetic)
A semantic-phonetic compound: the hand radical 扌 gives the meaning (an action done with the hands), while 非 supplies the sound. The original sense was to push or shove aside with the hand, which extended to arranging things in a row, hence modern meanings like 'to arrange,' 'a row,' or 'to reject.'
水 — pictograph of flowing water
水 is a pictograph depicting a stream of flowing water, with the central line representing the main current and the side strokes showing splashing droplets or ripples. In oracle bone script it was drawn even more clearly as a wavy vertical line with branches. It retains its original meaning of 'water' and also serves as a radical, often appearing in the compressed form 氵.