godan verb (-mu), intransitive verb
fall and pile up; lie thick
Poetic or literary verb describing snow, leaves, or similar things falling and accumulating. Often used in descriptive or emotive contexts. Compare with the more common 降り積もる.
See also: 降り積もる
雪が静かに降り積む夜だった。
It was a night when snow quietly fell and piled up.
落ち葉が庭に降り積んで、秋の深まりを感じさせる。
Fallen leaves lie thick in the garden, evoking the deepening of autumn.