Scratch, a. Made, done, or happening by chance; arranged with little or no preparation; determined by circumstances; haphazard; as, a scratch team; a scratch crew for a boat race; a scratch shot in billiards. [Slang]
Scratch race, one without restrictions regarding the entrance of competitors; also, one for which the competitors are chosen by lot.
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scratch race
n : a race in which all contestant start from scratch (on equal
terms)