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arm

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noun [countable] arm pronunciation in British English /ɑː(r)m/ 
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singulararm
pluralarms
  1. 1
    one of the two long parts of your body with your hands at the end

    I put my arm around his shoulders.

    in someone's arms:

    She was holding the baby in her arms.

    under someone's arm (=between the arm and the side of the body):

    Jim was carrying a parcel under his arm.

    into someone's arms:

    The children threw themselves into their grandmother's arms.

    fold/cross your arms (=put one arm on top of the other):

    She folded her arms across her chest.

    take someone in your arms:

    He took her in his arms and kissed her.

  2. 3
    a long thin part of an object that sticks out from the main part

    The crane's huge metal arm lifted the load into the air.

  3. 4
    a part of an organization that deals with a particular subject or activity

    the retailing arm of the business

    an arm of the Justice Department

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