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underdog (n.)
"the beaten dog in a fight," 1887, from under + dog (n.). Compare top dog "dominant person in a situation or hierarchy" (see top (adj.)). Its opposite, overdog, is attested by 1908.
I'm a poor underdog
But tonight I will bark
With the great Overdog
That romps through the dark.
[from "Canis Major," Robert Frost, 1928]
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Definitions of underdog from WordNet
Dictionary entries near underdog
undercover
undercroft
undercurrent
undercut
underdeveloped
underdog
underdone
underdressed
under-employed
under-employment
underestimate