A1[C]either of the two long parts of the upper body that are fixed 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).The armC2[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 jacketthe arm of a chairParts of clothesChairs and seatsarm in armC2When 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.Having in your hands