A dark spot or stain on something, especially an irregular mark that appears on skin or paper.
Origin uncertain but possibly from 'blot' (a stain) plus '-ch' suffix, or from Dutch/Scandinavian roots. First recorded in the 1500s.
Blotches on skin can mean you're nervous (embarrassment shows immediately) or sick (a rash announces illness before you speak), making them an involuntary truth-teller.
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