arm definition, meaning - what is arm in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “arm”

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arm

noun uk   /ɑːm/  us   /ɑːrm/

arm noun (BODY PART)

A1 [C] either of the two long parts of the upper body that are attached to the shoulders and have the hands at the end: My arms ache from carrying this bag. She put/threw her arms round me and gave me a hug. He took/held her in his arms (= held her closely). Bill arrived at the party with his new girlfriend on his arm (= her hand resting on his arm).C2 [C] 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 the arm of a chairarm in arm C2 When two people are arm in arm, they both have one arm bent at the elbow and passing around and supporting, or being supported by, the arm of the other person: We walked arm in arm along the river bank.
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arm noun (WEAPONS)

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.

arm noun (OF LAND/WATER)

[C] An arm of land or water is a long, thin part of it that is joined to a larger area.

arm noun (OF ORGANIZATION)

[C] An arm of an organization is a part of it that is responsible for a particular activity or place: The British company is one arm of a large multinational.

arm

verb uk   /ɑːm/  us   /ɑːrm/
[I or T] to provide yourself or others with a weapon or weapons: Nobody knows who is arming the terrorists. I armed myself with a baseball bat and went to investigate the noise. They are currently arming for war.
Opposite
C2 [T] to provide yourself or others with equipment or knowledge in order to complete a particular task: She armed herself for the interview by finding out all she could about the company in advance. I went to the meeting armed with the relevant facts and figures.
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(Definition of arm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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