bandwagon

from WordNet (r) 3.0 (2006)

bandwagon
    n 1: a popular trend that attracts growing support; "when they
         saw how things were going everybody jumped on the
         bandwagon"
    2: a large ornate wagon for carrying a musical band; "the gaudy
       bandwagon led the circus parade"

from The Collaborative International Dictionary of English v.0.48

bandwagon \bandwagon\ n.
   1. A popular trend that attracts growing support. "when they
      saw how things were going everybody jumped on the
      bandwagon."
      [WordNet 1.5]

   2. A large ornate wagon for carrying a musical band. "the
      bandwagon led the circus parade"
      [WordNet 1.5]