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English definition of “arm”

arm

noun (WEAPONS)    /ɑːm/ US  /ɑːrm/
arms [plural] weapons and equipment used to kill and injure people: They have been charged with supplying arms to the guerrillas. An arms cache was discovered in South Wales. The minister has called on the terrorists to lay down their arms (= stop fighting). They are willing to take up arms (= prepare to fight) (against the government) if they have to.Arms and munitions in general
(Definition of arm noun (WEAPONS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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