sweep room
n.β Β«The school also uses whatβs called a βsweep room,β where students spend the hour if theyβre found wandering the halls after the period bell has rung.Β» ββContrary to rumors, it was a normal day at high school” by Jason Miller News-Dispatch (Michigan City, Indiana) Sept. 15, 2006. (source: Double-Tongued Dictionary)