Etymology
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mammy (n.)

child's word for "mother," 1520s, diminutive of mam (see mamma). Meaning "black woman having the care of white children" (who often continued to call her mammy after they were grown) is by 1837, Southern U.S. dialect, a variant of mamma.

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mummy (n.2)

1784, a childish alteration of mammy. Alternative form mumsy attested by 1876.

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