Etymology

cousin-in-law

Today it means: Husband or wife of one's cousin. Full definition →

English cousin ← Middle English cosyn ← Old French cosin
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The story

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincon-
  6. Proto-Indo-European*swé
  7. Proto-Indo-European*h₁ésh₂r̥
  8. Proto-Indo-European*su-h₁ésh₂-ōr?
  9. Proto-Indo-European*swé
  10. Proto-Indo-European*swésōr
  11. Proto-Italic*swesōr
  12. Proto-Italic*swesrīnos
  13. Latinsobrīnus
  14. Latincōnsobrīnus
  15. Old Frenchcosin
  16. Middle Englishcosyn
  17. Englishcousin
  18. English todaycousin-in-law

From cousin + -in-law.

Etymology from Wiktionary, CC BY-SA 4.0.