Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One who does something: a doer of evil deeds.
  • n. A particularly active, energetic person: a real doer in party politics.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Someone who does, performs, or executes; an active person, an agent.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who does; one who performs or executes; one who is wont and ready to act; an actor; an agent.
  • n. An agent or attorney; a factor.

from The Century Dictionary and Cyclopedia

  • n. One who does something; one who performs or executes; an efficient actor or agent.
  • n. Specifically In Scots law, an agent or attorney.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a person who acts and gets things done

Etymologies

From do +‎ -er. (Wiktionary)

Examples

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