We found one dictionary that defines the word flexed its muscles:

General (1 matching dictionary)

1. flexed its muscles: Merriam-Webster

▸ Words similar to flexed its muscles ▸ Usage examples for flexed its muscles ▸ Idioms related to flexed its muscles ▸ Wikipedia articles (New!) ▸ Words that often appear near flexed its muscles ▸ Rhymes of flexed its muscles ▸ Invented words related to flexed its muscles