一切經音義 6.22

6.22

與趺（上餘渚反說文從[臼/一/八][├/(司-口)]聲也或作与古字也下府無反古今正字云足上也說文正體從付作跗經從夫作趺俗字通用或有從不作𧿤非也）。

與趺 ("giving the instep [or: sitting cross-legged]": the upper character has the fanqie 餘渚 [yǔ]. Shuowen says it is composed of [臼/一/八] with [├/(司-口)] as the phonetic; it is also written as 与, an ancient character. The lower character has the fanqie 府無 [fū]. Gujin zhengzi says: "The top of the foot." The standard form in Shuowen is written with 付 as 跗. In the scripture text it is written with 夫 as 趺, which is an interchangeable vulgar form. Some write it with 不 as 𧿤, which is incorrect.)