sweep room n. a place in which tardy students are detained in lieu of sending them to their classes. Etymological Note: So named because students are gathered in searching sweeps of hallways and grounds. (source: Double-Tongued Dictionary)
Further reading
In 1968, students at Cheyenne High School in Cheyenne, Wyoming, compiled a collection of their own slang, including the word Clyde, used to refer to one’s head, as in Use your Clyde! This is part of a complete episode. Transcript of “Use Your Clyde”...
In English-speaking countries, overprotective Moms and Dads are called helicopter parents for the way they hover and meddle in their children’s lives. In Denmark, they’re called curling forældre, or curling parents, alluding to the sport of curling...