gang up
Intermediate (B1) informal
When several people join together to act against one person or thing.
"The older boys used to gang up and chase the younger kids home from school."
Hear it in context
Why Hives Turn Against Their Queens
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The workers might gang up on the old
Why wasn't Teddy Roosevelt allowed to fight in World War One? (Short Animated Documentary)
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would gang up on them to reduce their power.