一切經音義 5.187

5.187

慣習（開患反考聲云謂習也左傳作貫假借字也說文作遦通也經中作串古字亦通也）。

Habituated and practiced (慣習) (The first character has the fanqie kai + huan [k-]. The Kaosheng says: 'Meaning practiced.' In the Zuo zhuan it is written 貫 as a phonetic loan character. The Shuowen writes 遦, which is interchangeable. In the sūtra it is written 串, an ancient character that is also interchangeable).