Etymology

threesome

three·some
T1H4R1E1E1S1O1M3E1

Today it means: A group of three people or things. Full definition →

Proto-Germanic *samaz ← Proto-Indo-European *somHós ← English three
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The story

  1. Proto-Indo-European*tréyes
  2. Proto-Germanic*þrīz
  3. Proto-West Germanic*þrīʀ
  4. Old Englishþrī
  5. Middle Englishthre
  6. Englishthree
  7. Proto-Indo-European*sem-
  8. Proto-Indo-European*somHós
  9. Proto-Germanic*samaz
  10. English todaythreesome

From three + -some.

Etymology from Wiktionary, CC BY-SA 4.0.