The continuation or deepening of a suntan that occurs even after exposure to sunlight has ended.
Compound of 'after' and 'tan' (from Old English 'tannian' meaning to make leather brown). Modern term related to UV exposure effects on skin.
Your skin continues darkening for 24-48 hours after sun exposure—this 'aftertan' happens because your body is still producing melanin even indoors, which is why sunburns feel worse the next day!
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