牛耳(ぎゅうじ)る

団長(だんちょう)が団体(だんたい)を牛耳(ぎゅうじ)っている。

The leader is controlling the group. {to control, to take the lead in, to have under one's thumb}

この党内(とうない)を牛耳(ぎゅうじ)っているのは党首(とうしゅ)です。

The party leader is the one who controls this party from within. {to control, to take the lead in, to have under one's thumb}

この国(くに)の裏(うら)社会(しゃかい)を牛耳(ぎゅうじ)るのはマフィアのドンである。

The Mafia Don is the one who controls the underworld of this country. {to control, to take the lead in, to have under one's thumb}

長老(ちょうろう)が牛耳(ぎゅうじ)っているこの町(まち)の住民(じゅうみん)に僕(ぼく)が何(なに)を言(い)おうが無駄(むだ)である。

No matter what I say to the residents of this town, which is under the control of the elders, it would be futile. {to control, to take the lead in, to have under one's thumb}

この世界(せかい)は闇(やみ)の支配者(しはいしゃ)に牛耳(ぎゅうじ)られているという陰謀(いんぼう)論(ろん)が広(ひろ)がっています。

A conspiracy theory that this world is being controlled by the ruler of darkness is spreading. {to control, to take the lead in, to have under one's thumb}