四分律行事鈔資持記 2.1443

2.1443

叉腰戒。（譏云以手叉腰，如人新婚得志憍放，又坐戒，妨比座故。）匡肘，謂兩肘有如匡器焉。開緣指上，即有病、肩臂有瘡、僧寺內等。

The precept against akimbo hands. (Criticizing: 'With hands akimbo, like a newlywed man full of arrogant abandon; and in the sitting precept, it disturbs adjacent seats.') 'Framed elbows' means the two elbows are like framed baskets. The exceptional conditions are indicated above, namely illness, sores on the shoulder or arm, being inside a monastery, and so on.