一切經音義 87.203

87.203

吸氣（上歆邑反說文吸內息也從口及聲論作喰俗字）。

Inhaling breath (吸氣) (the first character is pronounced xin-yi fan; the Shuowen says: "Xi means to draw in breath; it follows the mouth radical [口] with ji [及] phonetic." The treatise writes it as 喰, a vulgar character).