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
After our conversation about towns with extremely short names, many listeners wrote to tell us about Why, Arizona. Others pointed out that there are towns called Ely in Iowa, Minnesota, and Nevada. Other super-short appellations include Rye, New...
A flashlight doesn’t flash. It provides a steady beam of light. So why is it called a flashlight? The earliest versions lit up only briefly before the batteries gave out and required a recharge, so they were literally “flash lights...