JLPT N1
冬眠
冬眠 is the word for animal hibernation. But people also use it humorously for those who stay cooped up indoors all winter.
Readings
Other forms
冬眠する verb form
冬眠状態 state of hibernation
Noun, Suru verb
Hibernation / Winter Sleep
Literally, this refers to the deep sleep or inactivity of animals like bears during winter. Figuratively, it describes a person who stays indoors and is very inactive during the cold months.