Definition of “arm” - English Dictionary

“arm” in British English

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armnoun

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 chair
arm 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 (OF LAND/WATER)

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

armverb

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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“arm” in American English

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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)

“ARM” in Business English

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ARMnoun [ C ]

uk us also variable rate mortgage US FINANCE, PROPERTY

adjustable rate mortgage: a loan for buying a house in which the interest rate can change:

ARM loans

armnoun [ C ]

uk /ɑːm/ us

a part of a large company or organization that is responsible for a particular activity or place:

A loss on the sale of its outdoor advertising arm pre-tax profits.
The German arm accounted for about 40% of materials handling.

(Definition of “ARM” from the Cambridge Business English Dictionary © Cambridge University Press)