expression, godan verb (-ru)
take the lead; control; be the leader
Idiomatic expression meaning to seize leadership or control over a group, organization, or situation. Often used in political, business, or competitive contexts.
彼は会議で牛耳を執り、議論を自分の思い通りに進めた。
He took the lead in the meeting and steered the discussion as he wished.
That faction holds control within the party.