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
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
Whippoorwills, bob whites, and chickadees. How do we decide the names of birds and what to call their calls? Plus, the last syllables of Arkansas and Kansas are pronounced differently, but they come from the same etymological root. And: What’s the...