To do something excessively or to too great a degree; to cook something for too long.
Combination of 'over-' (excessive) and 'do' (to perform). The word has been used since at least the 1500s to describe doing anything beyond proper limits or moderation.
People often overdo salt in cooking to make up for other weak flavors, but salt receptors adapt quickly—the first bite tastes salty, but in 20 minutes your taste buds adjust and you barely notice it, so overdoing salt makes you want even more.
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