Etymology

mouthsore

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Today it means: A sore in or of the mouth. Full definition →

Middle English *mouthsor ← Old English mūþsār
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The story

  1. Old English · inherited frommūþsār“mouthsore”
  2. Middle English · inherited from*mouthsor
  3. English todaymouthsore

From Middle English *mouthsor, *muthsar, from Old English mūþsār (“mouthsore”), equivalent to mouth + sore.

Etymology from Wiktionary, CC BY-SA 4.0.