rally around

rally around idiom
Join in a common effort, as in When Mom broke her leg the entire family rallied around to help. This idiom gained currency with George F. Root's famous Civil War song, “The Battle Cry of Freedom,” which urges troops to rally round the flag that goes with them into battle. [Early 1800s]

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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