The kanji 吸 fundamentally represents the action of "inhaling," "sucking," or "absorbing." It depicts the act of drawing something in, whether it be air, liquid, or information. The core meaning focuses on the process of taking something into oneself or something else.

・On-yomi (音読み): キュウ (kyuu) ・Kun-yomi (訓読み): す(う) (su(u))

⚫︎ 呼吸 (kokyuu) Translation: Respiration, breathing ⚫︎ 吸引 (kyuuin) Translation: Suction, attraction ⚫︎ 吸水 (kyuusui) Translation: Water absorption

The kanji 吸 is a phono-semantic compound (形声文字, keisei moji). It combines the phonetic component 及 (kyuu), which suggests the sound, with the mouth radical 口 (kuchi), indicating the meaning. The mouth radical signifies the action related to the mouth such as breathing or taking in. Therefore, the structure suggests "something the mouth takes in," thus meaning "to suck," "to inhale," or "to absorb."