under one's thumb

Prepositional phrase

idiomatic

(idiomatic) Completely controlled by someone; at someone's command.

Japanese Meaning

完全に支配されている状態 / 誰かに思い通りにコントロールされている状態 / 絶対的に権力を握られている状況

She refused to be under one's thumb any longer and left the relationship to regain her independence.

彼女はこれ以上誰かの言いなりになることを拒み、自立を取り戻すためにその関係を去った。

Sense（1）

(idiomatic) Completely controlled by someone; at someone's command.

She has the entire crew under her thumb. They would do anything for her.