むし こたつ虫 LinksSentence search for こたつ虫Sentence search for こたつむしSentence search for 炬燵虫Kanji details for 虫Edit in JMdict Noun1. someone who curls up under a kotatsu all winter; kotatsu bug; kotatsu snailColloquial, See also こたつ, See also こたつむり, pun on かたつむりOther forms炬燵虫 【こたつむし】 Discussions Log in to talk about this word.