godan verb (-mu), intransitive verb
stop raining or snowing
Intransitive verb used for precipitation ceasing. Often used in the past tense 降り止んだ to describe that rain or snow has stopped.
雨が降り止んだら出かけよう。
Let's go out when the rain stops.
雪は朝まで降り止まなかった。
The snow didn't stop until morning.
Standard kanji spelling.
Mixed kanji-kana spelling; common in everyday writing.
止む is a general intransitive verb for stopping (rain, wind, sound, etc.), while 降り止む specifically refers to precipitation stopping.
Compound of 降り (continuative form of 降る 'to fall (rain, snow)') + 止む 'to stop'.