こたつ虫 こたつむし Also written 炬燵虫 Meanings Noun someone who curls up under a kotatsu all winter; kotatsu bug; kotatsu snail (pun on かたつむり) See also: こたつ. See also: こたつむり. Kanji 虫 insect. Read as むし. Word lists Colloquial Jinuma: Japanese Dictionary · Word lists