Definition of overdog noun from the Oxford Advanced American Dictionary

 

overdog

 noun
noun
NAmE//ˈoʊvərˌdɔɡ//
 
(disapproving)
 
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a person, organization, or country that is successful or in a stronger position than others, especially when they seem to have an unfair advantage political leaders who support the interests of the overdog The judge had a reputation as a champion of the overdog. This newspaper aims to defend the underdog and bite the ankle of the overdog. opposite underdog
See the Oxford Advanced Learner's Dictionary entry: overdog