longshot

When a contestant of a competition has no probability of winning, but wins anyhow, it is a longshot.

When you try to guess a result of something, but in fact you don't know at all what will be the outcome of it, that is a longshot, it is a wild guess.
I guessed the 3 last Superbowl winners, all longshots.
by Lilian8 October 02, 2006
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