noun
kotatsu cover; quilt for kotatsu
A thick futon or cloth placed over the kotatsu frame to trap heat; often used together with the tabletop board.
寒くなったので、こたつ掛けを出した。
It got cold, so I took out the kotatsu cover.
このこたつ掛けは厚手で暖かい。
This kotatsu quilt is thick and warm.
Compound of こたつ (kotatsu, heated table) and 掛け (covering, from 掛ける 'to hang/cover'). The kanji spellings use 炬燵 or 火燵 for kotatsu, but the word is usually written in kana.