noun
reed drawing-in; denting
Technical term in weaving: the process of drawing warp threads through the dents of a reed.
筬通しは織物の準備工程の一つです。
Reed drawing-in is one of the preparatory processes in weaving.
この工場では筬通しを手作業で行っている。
In this factory, denting is done by hand.
Compound of 筬 (おさ, 'reed') and 通し (とおし, 'passing through'). The exact historical derivation is uncertain, but the term directly describes the weaving process.