[muhth -er-in-law] /ˈmʌð ər ɪnˌlɔ/

noun, plural mothers-in-law.
the mother of one’s husband or wife.
noun (pl) mothers-in-law
the mother of one’s wife or husband

mid-15c., “mother of one’s spouse,” from mother (n.1) + in-law. Also in early use, “stepmother.” In British slang c.1884, mother-in-law was “a mixture of ales old and bitter.”


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