overdog

/ˈoʊvərˌdɔːɡ/
noun
  1. A person, group, or thing that is in a position of power, advantage, or likely to win in a competition or conflict.
    • The overdog in the election spent much more money on advertising.
    • In the championship match, the defending champion was the clear overdog.
    • Small businesses often struggle to compete against the overdog corporations.
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