Definition of muscularize in US English:

muscularize

(also muscularise)

verb

  • 1no object To become muscular; to put on muscle. rare.

  • 2with object To make muscular..

Origin

Early 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From muscular + -ize.

Pronunciation

muscularize

/ˈmʌskjʊlərʌɪz/