godan verb (-mu), intransitive verb
become muddy; get slushy
Describes ground, roads, or paths turning into deep, sticky mud, often after rain or thaw.
雨で道がぬかるんで歩きにくい。
The road has become muddy from the rain and is hard to walk on.
雪解けでグラウンド
The field is slushy from the melting snow.