ichidan verb, intransitive verb
begin to get dark; begin to set (the sun)
Describes the onset of evening or sunset. Often used with 日 (sun) or 空 (sky).
日が暮れかけると、街灯が点き始めた。
As the sun began to set, the streetlights started to come on.
外はもう暮れかけているから、早く帰ろう
It's already getting dark outside, so let's go home soon.