from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One who upsets (something); a disrupter.
  • n. A person or device that turns something upside down

from The Century Dictionary and Cyclopedia

  • n. One who or that which upsets; also, one who or that which sets up; specifically, a tool used in upsetting a tire.

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

  • n. an unexpected winner; someone who defeats the favorite competitor


upset +‎ -er (Wiktionary)



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