Missus

google

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late 18th century: representing an informal pronunciation of mistress; compare with Mrs.

wiktionary

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Representing a typical pronunciation of Mrs, a corrupted form of Mistress.

etymonline

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missus (n.)

also missis, a colloquial contraction of mistress; as the oral form of Mrs., from 1790; the missus "the wife" is attested by 1833.