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1. A tissue composed of fibers capable of contracting to effect bodily movement.
2. A contractile organ consisting of a special bundle of muscle tissue, which moves a particular bone, part, or substance of the body: the heart muscle; the muscles of the arm.
3. Muscular strength: enough muscle to be a high jumper.
4. Informal Power or authority: put some muscle into law enforcement.
v. mus·cled, mus·cling, mus·cles
To make one's way by or as if by force: muscled into the conversation.
To move or force with strength: muscled legislation through Congress.

[Middle English, from Old French, from Latin mūsculus, diminutive of mūs, mouse; see mūs- in Indo-European roots.]

mus′cly adj.
References in classic literature ?
My horse was not above medium size, but he was alert, slender-limbed, muscled with watch- springs, and just a greyhound to go.
Taglat was no longer young; but he was still a formidable beast, mightily muscled, cruel, and, because of his greater experience, crafty and cunning.
One of the younger apes, a huge, splendidly muscled brute, was edging threateningly closer to the ape-man.