The bottom or lower surface of something. The part that faces downward or is hidden from normal view.
Compound word formed from 'under' (Old English under) and 'side' (Old English sīde). This straightforward combination emerged in Middle English as a practical term for describing spatial relationships and hidden surfaces.
Many animals have fascinating undersides that are completely different from their tops - like sharks with dark tops and white bellies for camouflage, or butterflies with cryptic underwing patterns. The 'underside' often tells a different story than what we see on the surface.
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