Verb (5-dan, う, transitive)
1. to swing; to wield (physically); to exert
彼はそもそも、剣を振るうこともできそうもない。To begin with, he doesn't even look like he could swing a sword.
2. to exercise (e.g. power, ability); to exhibit; to display; to wield (metaphorically)
権力や権限を振るうべきではない。One should not exercise power or authority.
3. to flourish; to prosper; to thrive