一切經音義 7.119

7.119

欠㰦（丘據反埤蒼云張口欠㰦出氣也經文從口作呿者非也乃是睡聲也）。

Yawning and opening the mouth (qianqu 欠㰦: [the lower word is pronounced with the fanqie] qiu + ju [qu]. The Picang says: 'Opening the mouth, yawning, and expelling breath.' In the sūtra text it is written with the mouth radical 口 as 呿, which is incorrect; that is merely the sound of sleeping.).