Definitions

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun an unexpected winner; someone who defeats the favorite competitor

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

upset +‎ -er

Examples

Comments

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