"uproar, disturbance, riot," 1764 (Foote), a word of unknown origin, "prob. a fanciful formation" [OED], possibly an alteration of robustious "boisterous, noisy" (1540s; see robust). Rumpus room "play room for children in a family home" is from 1938.
updated on October 21, 2021
Dictionary entries near rumpus