排放
páifàng · HSK 7
discharge
💨 排 expel/排出 + 放 release = let gas out, i.e. discharge or emit
排 carries the sense of expelling or排出, and 放 means to release or let go. Together 排放 is the controlled letting-out of gas or waste, the word used for emissions and drainage.
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.'
放 — 方 (square/phonetic) + 攵 (rap/strike radical)
放 is a semantic-phonetic compound: 方 supplies the sound and 攵 (a hand holding a stick) supplies the meaning of striking or driving away. The original sense was to banish or drive out, which broadened over time to 'release', 'let go', and 'put down'.