noun

1. A contractile form of tissue which animals use to effect movement.

   “Muscle consists largely of actin and myosin filaments.”

2. An organ composed of muscle tissue.

3. (usually in the plural) A well-developed physique, in which the muscles are enlarged from exercise.

Synonyms: thew

verb

1. To use force to make progress, especially physical force.

   “He muscled his way through the crowd.”