climb on the bandwagon
To join a particular cause or political party: “When the party leader saw how popular the opposition was becoming, he decided to climb on the bandwagon and offer his full support to his opponent.”
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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.