The time of day just after sunset when it is getting dark but not completely night.
From Old English 'dox' or 'dusc' meaning 'dark' or 'shadowy'. Over centuries, it narrowed to mean the specific dim time between day and night.
Dusk and dawn are like mirror images: one is light fading, the other is light growing. Many animals and even human moods shift at dusk because our brains react to the changing light.
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