The kanji 膨(ぼう) primarily conveys the idea of expansion, swelling, or bulging. It describes something increasing in size, volume, or physical prominence. This expansion can be due to various factors, such as internal pressure, the absorption of liquid or gas, or simply an increase in content. The core concept is one of becoming larger or more prominent.

・On-yomi (音読み): ボウ (bou) ・Kun-yomi (訓読み): ふく（らむ） (fuku(ramu)), ふ（くれる） (fu(kureru))

⚫︎ 風船が膨らむ Translation: The balloon swells up. ⚫︎ お腹が膨れる Translation: The stomach bulges/swells. ⚫︎ 期待に胸が膨らむ Translation: My chest swells with anticipation/expectation.

The kanji 膨 is a phono-semantic compound (形声文字, keisei moji). The semantic component is 月 (getsu, meaning "flesh" or "body") and the phonetic component is 彭 (hou), which conveys the sound. The combination suggests that the body is expanding or becoming larger.