before dark

Prepositional phrase

Before night begins to fall. From morning until evening. In the daytime before sunset.

Japanese Meaning

夜が訪れる前に / 暗くなる前に / 夕日が沈む前に

We need to finish the hike before dark to avoid getting lost.

暗くなる前に迷わないようにハイキングを終えなければならない。

Sense（1）

Before night begins to fall. From morning until evening. In the daytime before sunset.

I think you should finish mowing the lawn before dark.