From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. (Pugilistic Matches) A line across the prize ring; up to which boxers are brought when they join fight; hence, test, trial, or proof of courage; as, to bring to the scratch; to come up to the scratch. [Cant] --Grose.
5. (Billiards) (a) A shot which scores by chance and not as intended by the player; a fluke. [Cant, U. S.] (b) a shot which results in a penalty, such as dropping the cue ball in a pocket without hitting another ball. [1913 Webster +PJC]
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