流し
ながし · nagashi · JLPT N1 · noun
sink
🚰 流し (nagashi) = sink, from 流す (nagasu) 'to flow, to let run'; water flows down the drain
The verb 流す means 'to let flow', so 流し names the basin where water runs away. Nagashi shares the root of 流れ (nagare, 'a flow').
流 — water radical 氵 + 㐬 (phonetic, child being born)
流 is a semantic-phonetic compound. The water radical 氵 gives the meaning, while 㐬 depicts an infant being born head-down with amniotic fluid, suggesting downward flow. Together they convey water flowing, and by extension 'to flow' or 'current'.