1. 时尚；浪潮
    You can refer to an activity or movement that has suddenly become fashionable or popular as a bandwagon .

    e.g. So what is really happening as the information bandwagon starts to roll?
           当信息大潮滚滚而来的时候究竟发生了些什么呢？
    e.g. ...the environmental bandwagon.
           环保热潮

2. （尤指政客顺应的）时髦，潮流
    If someone, especially a politician, jumps or climbs on the bandwagon, they become involved in an activity or movement because it is fashionable or likely to succeed and not because they are really interested in it.

    e.g. In recent months many conservative politicians have jumped on the anti-immigrant bandwagon...
           最近几个月，很多保守政客都搭上了“反移民”这班车。
    e.g. Many farms are jumping on the bandwagon and advertising organically grown food...
           很多农场正赶潮流宣传有机食品。

noun

1. a large ornate wagon for carrying a musical band

    e.g. the gaudy bandwagon led the circus parade

2. a popular trend that attracts growing support

    e.g. when they saw how things were going everybody jumped on the bandwagon