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Definition of Upsetter
1. Noun. An unexpected winner; someone who defeats the favorite competitor.
Definition of Upsetter
1. Noun. One who upsets (something); a disrupter. ¹
2. Noun. A person or device that turns something upside down ¹
¹ Source: wiktionary.com
Definition of Upsetter
1. one that upsets [n -S] - See also: upsets