A dark area or shape created when light is blocked by an object, or a faint outline of something.
From Old English 'sceadwe,' related to Old Saxon 'skado' meaning 'shade.' The word originally referred more to shade from sunlight, gradually broadening to mean the dark shape cast by an object.
Shadows are proof that light travels in straight lines—they only exist because light can't bend around objects, which is why shadows have crisp edges and disappear in complete darkness.
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