Kelly day
n.— «The delegation…explained that firemen work one day and have the next day off with every 10th day designated as a “Kelly” day or day off. This schedule is followed except during the vacation period when the Kelly days are granted every 12th day.» —“Board Planning Fire Station Warning Lights” Winona Daily News (Minnesota) May 23, 1957. (source: Double-Tongued Dictionary)
Further reading
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