勢いきおいを振ふるう

expression, godan verb (-u)

wield power; exercise authority

Used when someone in a position of power actively uses their influence or authority, often with a sense of vigor or forcefulness.

• 新しん社しゃ長ちょうは会かい社しゃで勢いきおいを振ふるっている。

  The new president is wielding power in the company.

• 彼かれはその組そ織しきで勢いきおいを振ふるうようになった。

  He came to exercise authority in that organization.