closing of the winter hearth
A seasonal custom of putting out the hearth fire at the end of winter, marking the transition to spring. Often associated with traditional Japanese life and haiku season words.
On the day of closing the winter hearth, the family quietly put out the fire in the sunken hearth.
Compound of 炉 (ro, 'hearth') and 塞ぎ (fusagi, noun form of 塞ぐ, 'to close, block').