dark horse
/ˈd?rk ˈˌh?rs/
noun
1. a candidate or competitor about whom little is known but who unexpectedly wins or succeeds.
"a dark-horse candidate" Join us for a monthly tour of writers who give as good as they get. From hard science-fiction to stark, melancholic apocalypses; from Lovecraftian horror to zombies and horror comedy; from whimsical interludes to tales of unlikely compassion--whatever it is, if it's...
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