arm Meaning in Cambridge American English Dictionary
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Meaning of "arm" - American English Dictionary

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armnoun [C]

 us   /ɑrm/

arm noun [C] (BODY PART)

either of the two long parts of the upper body that are joined to the shoulders and have hands at the end: Her arm was bandaged from elbow to wrist. He held his young son in his arms (= closely). The arm of a piece of clothing or furniture is a part of it that you put your arm in or on: the arm of a jacket/chair An arm of an organization is a part of it with particular responsibilities: the company's investment banking arm

armverb [T]

 us   /ɑrm/

arm verb [T] (PROVIDE WEAPONS)

to provide yourself or others with a weapon or weapons: He armed himself with a baseball bat before going outside.
(Definition of arm from the Cambridge Academic Content Dictionary © Cambridge University Press)
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