Climbing on the bandwagon - Idioms by The Free Dictionary
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climb on the bandwagon
To join or follow something once it is successful or popular. I can't stand these people who just climb on the bandwagon after a win. Where were they last year when the team was terrible? A: "I thought your mom hated that candidate." B: "Well, he's the president now, so she's climbed on the bandwagon."
climb/jump on the ˈbandwagon (informal, disapproving) do something that others are already doing because it is successful or fashionable: As soon as their policies became popular, all the other parties started to climb on the bandwagon.At political celebrations in the USA, there was often a band on a large decorated vehicle (= a bandwagon). If somebody joined a particular ‘bandwagon’, they publicly supported that politician in order to benefit from their success.