under someone's thumb
US /ˈʌndər ˈsʌmˌwʌnz θʌm/
UK /ˈʌndər ˈsʌmˌwʌnz θʌm/

1.
di bawah kendali seseorang, di bawah telunjuk seseorang
completely under someone's control
:
•
She has her husband completely under her thumb.
Dia memiliki suaminya sepenuhnya di bawah kendalinya.
•
The whole department is under his thumb.
Seluruh departemen di bawah kendalinya.