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English definition of “muscle”

muscle

noun [C/U]    /ˈmʌs·əl/
biology a mass of tissue in the body , often attached to bones , that can tighten and relax to produce movement Muscle is also the power to do things or to make people behave in a certain way: [U] Republicans are flexing some political muscle.
(Definition of muscle noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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