Etymology

doer

do·er
D2O1E1R1

Today it means: Someone who does, performs, or executes; an active person, an agent. Full definition →

Middle English doer ← Old English dōere
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The story

  1. Old English · inherited fromdōere“a doer; worker”
  2. Middle English · inherited fromdoer
  3. English todaydoer

From Middle English doer, doar, doere, from Old English dōere (“a doer; worker”), equivalent to do + -er.

Etymology from Wiktionary, CC BY-SA 4.0.