noun
Refers to the silky case spun by insect larvae for pupation. Used in both literal and metaphorical contexts (e.g., a protective environment).
蚕がコクーンを作り始めた。
The silkworms have started spinning cocoons.
彼女は都会の喧騒から離れ、自分のコクーンに閉じこもった。
She retreated into her own cocoon, away from the hustle and bustle of the city.