back boxing

back boxing

[′bak ¦bäk·siŋ] (building construction) backlining

back lining

1. A thin wood strip which lines a window casing, next to the wall and opposite the pulley stile, and provides a smooth surface for the working of the weighted sash; also called back boxing or a back jamb. 2. That piece of framing forming the back recess for boxing shutters.