also: さく
noun
bamboo mat; reed mat
A mat made from split bamboo or reeds tied together. Rare standalone word; more often seen in compounds like 簀の子 (sunoko, slatted floor or drainboard) or in historical descriptions.
昔の家では、簀を敷いてその上に布団を敷いた。
In old houses, they would lay a bamboo mat and put futons on top of it.
The kanji 簀 is composed of 竹 (bamboo) and 責 (responsibility/blame), but the exact derivation is uncertain. The word likely originated from the material (bamboo) and its use as a mat.