take up arms

idiom

Definition of take up arms

: to pick up weapons and become ready to fight They took up arms to defend their city. The rebels are taking up arms against their own government.

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“Take up arms.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/take%20up%20arms. Accessed 14 December 2019.

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