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father-in-law

Today it means: One's spouse's father. Full definition →

Middle English fader in lawe

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The story

Middle English · inherited fromfader in lawe
English todayfather-in-law

From Middle English fader in lawe, fadyr-in-lay, fader yn lawe, equivalent to father + -in-law.

Etymology from Wiktionary, CC BY-SA 4.0.