muscle noun (BODY PART)
B2 [ C or U ] one of many tissues in the body that can tighten and relax to produce movement:
facial muscles
He flexed his muscles (= tightened them to make them look large and strong) so that everyone could admire them.
a muscle spasm (= a sudden uncontrollable tightening movement)
pull a muscle
Thesaurus: synonyms and related words
Substances & structures in the body
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