1. To make any substitution in a game, without the knowledge of one’s opponents, as to substitute crooked dice or marked cards; to bring an expert swindler into a game with unsuspecting adversaries; to pass off a master as an amateur; to enter a horse in a race after altering his identification marks in order to fake the odds, 2. To substitute an outsider for an absent member of a gang; to bring in a specialist to execute a difficult assignment; to force (oneself) into a desirable position in a game or racket. “We got to ring in a good wheelman (chauffeur) on this score (robbery). The town is lousy with (teeming with) squad cars (police squad cars)." 3. To report by telephone, as a policeman on beat; to punch a clock, as a watchman.

- american underworld dictionary - 1950

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