An underdog is a team or person that is expected to lose, but in fact ends up winning. This is usually because the underdog is very talented, or because the other team is not playing their best.
The underdog team was able to win because they were very talented.
The underdog candidate was able to win the election because he was able to connect with the people.
noun
one at a disadvantage and expected to lose
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Are you really on the side of the underdog
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It is the voice of the underdog we are presented with.
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I am on the side of the underdog.
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He was a friend of the sick, of the afflicted and the underdog.
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His role in the group is something of the underdog.
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Collins was widely viewed as the underdog in the race.
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The book's main theme is the invisibility of the underdog.
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I love cheering for the underdog and laughing at the delusional.
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I do root for the underdog and the meek and the underpriviledged.
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The fact that Edwards was the underdog was in most of the factual reporting.