under someone's thumb

US /ˈʌndər ˈsʌmˌwʌnz θʌm/
UK /ˈʌndər ˈsʌmˌwʌnz θʌm/
"under someone's thumb" picture
1.

〜の言いなりになって, 〜の支配下にある

completely under someone's control

:
She has her husband completely under her thumb.
彼女は夫を完全に手中に収めている
The whole department is under his thumb.
部署全体が彼の支配下にある