n. a person new at something; a neophyte, especially a police officer or a ballplayer. : The rookie tackled the old-time player and earned a lot of cheering and applause.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
rookie
1892, "raw recruit," originally in Kipling's Barrack-Room Ballads, perhaps from recruit, influenced by rook (1) in its secondary sense, suggesting "easy to cheat."