To lose hair; to become bald — typically used for a person's hair becoming thin or disappearing.
彼は年を取ってからだんだん禿げてきた。
He has gradually been going bald as he got older.
ストレスで早く禿げることもあると言われている。
It's said that stress can sometimes cause early hair loss.
帽子で禿げを隠すのは簡単ではない。
It's not easy to hide baldness with a hat.
To become bare (e.g., a hillside losing its trees or vegetation); to become exposed or stripped of cover.
台風の影響で山の一部が禿げてしまった。
Part of the mountain became bare due to the typhoon.
過放牧で草地が禿げて土がむき出しになった。
Overgrazing made the grassland bare and exposed the soil.