on the bandwagon, get

on the bandwagon, get idiom
Also, climb or hop or jump on the bandwagon. Join a cause or movement, as in More and more people are getting on the bandwagon to denounce cigarette smoking. This expression alludes to a horse-drawn wagon carrying a brass band, used to accompany candidates on campaign tours in the second half of the 1800s. By about 1900 it was extended to supporting a campaign or other cause.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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