/ˈmʌsl ||; ˈmʌsḷ/noun [C,U] one of the parts inside your body that you can make tight or relax in order to produce movement 肌肉: Riding a bicycle is good for developing the leg muscles. 骑自行车有助锻炼腿部肌肉。Lifting weights builds muscle. 举重使肌肉发达。