n.
Function: noun
Date: 14th century
1 a : a low heavy continuous reverberating often muffled sound (as of thunder) b : low frequency noise in phonographic playback caused by the transmission of mechanical vibrations by the turntable to the pickup
2 : a seat for servants behind the body of a carriage
3 a : widespread expression of dissatisfaction or unrest b : a street fight especially among gangs