The term 'JACKET ARMS' is a combination of two crossword solutions: 'JACKET' and 'ARMS'. JACKET is a type of clothing item that covers the upper body and ARMS, usually with a zipper or buttons. It is typically made of a thick material such as leather, wool, or denim. ARMS are the two upper limbs of the human body, extending from the shoulder to the hand. They are used for movement, balance, and support. Together, JACKET ARMS refers to the sleeves of a JACKET, which cover the ARMS and provide warmth and protection.