To Fall
To Come Down
intransitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means descend, but this word means something closer to to fall or to come down. Usually used with things like rain or snow.
The rain is to fall and you're outside anyway with your mouth open so you'll get a mouth full (ふる) of rainwater! All the ponds, wells, and your yard will be full of water too!
明日は雨が降るみたいですね。
It looks like it will rain tomorrow.
雪が降ってきたよ。
It's snowing.
そんな時に、思いがけない幸運が降ってきたんです。
Then at that time, an unexpected stroke of good fortune fell upon us.