having a sharp, sour taste, or (as a noun) a small pie or pastry with filling.
As an adjective, from Old English 'teart' meaning sharp or severe. As a noun, from Old French 'tarte' (pastry), possibly from Latin 'torta' (twisted bread).
Sour candies are 'tart' because they stimulate the same taste buds as lemons and limes—your mouth can't tell if something is actually sour or just made to taste that way!
Etymology: originally neutral (sour taste). By 16th–17th century, 'tart' applied to women meant sharp-tongued or shameless; by 19th century Victorian era, 'tart' became derogatory for sex worker—collapsing taste, temperament, and morality into gendered insult.
Use 'sharp-witted' or 'frank' for personality; keep 'tart' only for taste descriptor unless quoting historical text. Be aware British slang retains the derogatory edge.
["sharp-witted","frank","acidic (taste)","tangy"]
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