Third-person singular simple present indicative form of muscle.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "muscles" in a sentence
"The _fibres_ of muscles exist previously in full perfection, in the bread we eat; and when you make little round pills of the crumbs at your side, it is composed of fibres stolen from your muscles which enable the particles to stick together; and I say _stolen from your muscles_, because they are the _gluten_ which you ought to have eaten."
"FLATOW: And the fact that you're losing the weight from your muscles is alarming, I would think."
"For instance, I wouldn't have expected an hour on a jet ski to be particularly strenuous (and it was crazy fun), but the next day I had aches in muscles that felt like they hadn't been used in years."