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gang-up

[gang-uhp]
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noun
  1. an act of ganging up or uniting in opposition to someone or something.
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Origin of gang-up

1935–40; noun use of verb phrase gang up (on)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for gang up

gang up

verb
  1. (often foll by on or against) informal to combine in a group (against)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with gang up

gang up

1

Also, gang up with. Act together as a group. For example, The residents ganged up to make the neighborhood safer. [Colloquial; c. 1920]

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2

gang up on or against. Join in opposition or attack against, as in The big kids were always ganging up on the little ones, or They all ganged up against the substitute teacher. [1920s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.