What does こたつ mean?
こたつ is a Japanese noun meaning “kotatsu (heated table)” in English. It is written as こたつ in hiragana, and kotatsu in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
こたつで寝ちゃったら風邪引くのはあたりまえ。自己管理がなっていない。
Of course you'll catch a cold if you fall asleep under the kotatsu. You have to learn to take care of yourself.