- a wagon, usually large and ornately decorated, for carrying a musical band while it is playing, as in a circus parade or to a political rally.
- a party, cause, movement, etc., that by its mass appeal or strength readily attracts many followers: After it became apparent that the incumbent would win, everyone decided to jump on the bandwagon.
- US a wagon, usually high and brightly coloured, for carrying the band in a parade
- jump on the bandwagon, climb on the bandwagon or get on the bandwagon to join or give support to a party or movement that seems to be assured of success
also band-wagon, 1855, American English, from band (n.2) + wagon, originally a large wagon used to carry the band in a circus procession; as these also figured in celebrations of successful political campaigns, being on the bandwagon came to represent “attaching oneself to anything that looks likely to succeed,” a usage first attested 1899 in writings of Theodore Roosevelt.