1 definition by defs4u

Top Definition
When someone or something that's expected to lose, but later, they became the winner.
"I didn't expect that the other team won, they had only 2 points, what an underdog!"
"The red side was out numbered and think they were going to lose, but somehow, the blue team caught up and win the battle! They're the underdog!"
by defs4u May 06, 2009
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