Usage patterns
露が降りるdew forms/settles
Dew had settled on the grass in the garden this morning.
〈事〉を露ほども...ないnot even the slightest bit of ~
He didn't know even the slightest bit about that.
〈物〉に露がつくdew forms on something
Dew has formed on the leaves and is glistening.
Expressions
袂の露tears on the sleeves of one's kimono; weeping copiously 露知らずnot knowing at all; completely unaware; without the slightest idea 雨露をしのぐprotect against the elements; shelter from the weather