either of the two long parts that stick out from the top of the body and connect the shoulders to the hands He escaped with only a broken arm. She threw her arms around his neck. The officer grabbed him by the arm (= grabbed his arm). She touched him gently on the arm. He held the dirty rag at arm's length (= as far away from his body as possible). They walked along arm in arm (= with the arm of one person linked with the arm of the other). She cradled the child in her arms. They fell asleep in each other's arms (= holding each other). He was carrying a number of files under his arm (= between his arm and his body). He walked in with a tall blonde on his arm (= next to him and holding his arm).