1. either of the two long parts of the human body that extend from the shoulders to the hands
2. a part of a chair, sofa, or other piece of furniture that supports a person’s arm
3. a branch or division of an organization, especially a military force

1. to provide with weapons or military equipment
2. to prepare for conflict or difficulty

Examples

• She broke her arm in the accident.
• He rested his elbow on the arm of the chair.
• The research arm of the company developed new technology.
• The soldiers laid down their arms after the ceasefire.
• The government decided to arm the rebels.
• She armed herself with facts before the debate.
• The security guard crossed his arms.
• They linked arms and walked down the street.