arm
She broke her arm while skiing.
noun:the part of a piece of furniture, such as a chair or sofa, that supports the forearms
He rested his elbows on the arm of the sofa.
noun:a sleeve of a garment
The arm of his jacket was torn.
noun:a thing that is a subsidiary or extension of a larger or more important thing, such as a branch of an organization
The company's research and development arm is based in California.
verb:to supply or provide with weapons
The rebels armed themselves with captured rifles.
verb:to provide or furnish something with a particular capability or resource