In any competitive contest, the team or group expected to come out on top in the end.
As expected, Bootron the overdog completely PWND Noodle at Halo 2 last night.
by Sean Boots December 21, 2004
Opposite of an underdog, alternative term for a 'favourite' to win in a sporting contest or other competition.
Andy Murray is the overdog in this match against Feliciano Lopez today, having won in their previous eight meetings.
by statt0 March 23, 2014

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