Kelly shift
n.— «Under what is known as the “Kelly shift,” adopted by the Fire Department in 1969, firefighters worked a 27-day rotation consisting of one 24-hour shift, followed by 48 hours off. After repeating that cycle seven times, they got six days off in row.» —“Lawsuit leads to long, complicated legal battle” by Ed Kemmick Billings Gazette (Montana) Aug. 27, 2007. (source: Double-Tongued Dictionary)
Further reading
What’s it like to hike the Pacific Crest Trail all the way from Mexico to Canada? You’ll end up with sore muscles and blisters, and great stories to tell. Along the way, you’ll also pick up some slang, like NoBo, SoBo, Yo-yo and...
She sells seashells by the seashore. Who is the she in this tongue twister? Some claim it’s the young Mary Anning, who went on to become a famous 19th-century British paleontologist. Dubious perhaps, but the story of her rise from seaside...