on the wheel
 adj.— «On the wheel—A rotating work schedule, as 8 A.M.-to-4 P.M. shifts one week, 4 P.M.-to-midnight shifts the next week and midnight-to-8 A.M. shifts the next, complicated by the fact that many officers work four days on and two off.» —“Jargon Of Correction Officers” New York Times Mar. 26, 1982. (source: Double-Tongued Dictionary)

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