to flutter or swirl downwards (while falling), used for things like leaves, snow, or petals.
秋になると木の葉が舞い落ちる光景が美しい。
In autumn, the sight of leaves fluttering down is beautiful.
公園に雪が舞い落ちて、ベンチに薄い雪の層ができた。
Snow was fluttering down in the park, and a thin layer formed on the bench.
桜の花びらが枝から舞い落ちる様子に見とれてしまった。
I was captivated by the way the cherry petals fluttered down from the branches.