bandwagon - definition and synonyms

noun [countable] [usually singular] 

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  1. an idea or activity, especially in politics or business, that suddenly becomes very popular or fashionable, so that a lot of people want to be involved in it

    His recent poll victory could start an ultra-nationalist bandwagon rolling.

    jump on/climb on/join the bandwagon:

    Every business was trying to jump on the ‘dot-com’ bandwagon.