一切經音義 7.103

7.103

Two feet / Pair of feet (shuangzu 雙足: [the upper word is pronounced with the fanqie] shuo + [zhuo] [shuang]. Gu Yewang says: 'Shuang 雙 means two single items.' The Shuowen says: 'Shuang means two items.' The Fangyan says: 'Two flying birds are called shuang.' The Qunshu zhiyao says: 'The character shuang is categorized under zhui 隹—zhui is a bird—and under you 又—you is a hand; holding two birds in hand is shuang.' In the sūtra text it is written with jiu 久 as 双, which is incorrect; the error has persisted for a long time.).