肺
はい · hai · JLPT N3 · noun
lung
🫁 肺 = 月 (body part) + 巿; hai sounds like hi, and every hi needs a breath
The left side 月 is the flesh radical, which marks body organs, as in 腕 arm and 胃 stomach. The right side 巿 gives the sound. As a word, はい also means yes, and you need air from your lungs to say it.
肺 — flesh radical 月(肉) + 巿 fú phonetic
肺 is a semantic-phonetic compound. The left side 月 is the 'flesh/meat' radical (肉), marking it as a body organ, while the right side 巿 (fú) once hinted at the pronunciation. The character has meant 'lungs' since early Chinese medical texts.