Definition of "gang up" []

• To join together, as a gang. (verb)

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• "She’s no longer fending off the Derek Whalens of the world; instead, she and my husband gang up and tease me about my allegedly high-maintenance ways."
• "But Al knew from painful experience that girls'd kick you when you were down and gang up on you whenever they had the chance."
• "The inherited entanglement of the Concert of Europe offered Britain’s Lilliputian rivals the chance to gang up on the British Gulliver, pinning him down with multilateral treaties."