一切經音義 1.206

1.206

欠㰦（音去桂苑珠叢云引氣而張口曰欠㰦釋文張口氣啎也象氣從人上出之形從欠去聲也啎音悟經文從口作呿睡聲也非此義也）。

欠㰦 (Pronounced 去 [qù]. The Guiyuan zhucong says: 'Drawing in breath and opening the mouth wide is called 欠㰦.' The Shiwen says: 'Opening the mouth as breath encounters an obstacle; picturing the breath rising out from a person; it takes 欠 as radical and 去 as phonetic.' 啎 is pronounced 悟 [wù]. In the sūtra text, it is written with 口 as 呿, which is the sound of sleeping and not this meaning).