expression, noun
snake hibernation
Refers to the period when snakes enter their dens to hibernate, typically in winter. Used as a seasonal word in haiku and other traditional poetry.
蛇穴に入るは冬の季語です。
'Snake hibernation' is a winter season word.
この俳句には「蛇穴に入る」が使われている。
This haiku uses the phrase 'snake hibernation'.