The expression, “I have him pegged,” which has crept into common usage, is thieves’ slang pure and simple, and has nothing to do with the game of cribbage as many suppose. The thief, to save himself the trouble of staying up all night watching a spot to make sure no one enters after closing hours, puts a small wooden peg in the door jamb after the place is locked up. At five or six o’clock in the morning he takes a look. If the peg is in place the door has not been opened. If it is found lying in the doorway, that means somebody has opened the door in the night. If he finds the place is
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