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Noun: upsetter
  1. An unexpected winner; someone who defeats the favourite competitor

Derived forms: upsetters

Type of: victor, winner

Encyclopedia: Upsetter

Nearest

uprooter
uprush
ups and downs
ups-a-daisy
Upsala
upscale
upsell
upset
upset price
upset stomach
upsetter
upsetting
upshot
upside
upside down
upside-down
upside-down cake
upsilon
upskill
upslope
upstage