expression, ichidan verb
the sun sets; it gets dark
Describes the time when the sun goes down and darkness falls; often used to indicate the end of the day or the onset of evening.
冬はすぐに日が暮れる。
In winter, the sun sets quickly.
日が暮れる前に家に帰ろう。
Let's go home before it gets dark.
A fixed expression composed of 日 (sun) + が (subject marker) + 暮れる (to get dark, to come to an end). The verb 暮れる originally meant 'to end' or 'to become dark', and the phrase literally means 'the sun darkens/ends'.