1(especially formerly) a wagon used for carrying a band in a parade or procession:the colourful bandwagon was later purchased for use in circus parades
2an activity or cause that has suddenly become fashionable or popular:companies sought to strengthen their share prices by jumping on the dot-com bandwagonthey would not climb aboard the bandwagon of every fashionable social issue
bandwagon in other Oxford dictionaries
Definition of bandwagon in the US English dictionary
