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adverb
informal USUsed to express assent or agreement: ‘yes, sir’. Compare "yessir", "yessum".
Chiefly in representations of African-American speech. Now sometimes used to highlight offensive expectations or stereotypes of black servility.
Origin
Late 19th century; earliest use found in All the Year Round. Representing a colloquial, chiefly African-American, pronunciation of yes, sir.
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