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

1.
di bawah telunjuk seseorang, di bawah kawalan seseorang
completely under someone's control
:
•
She has her husband completely under her thumb.
Dia mempunyai suaminya sepenuhnya di bawah telunjuknya.
•
The whole department is under his thumb.
Seluruh jabatan di bawah telunjuknya.