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

1.
تحت سيطرة شخص ما, تحت إبهام شخص ما
completely under someone's control
:
•
She has her husband completely under her thumb.
زوجها تحت سيطرتها الكاملة.
•
The whole department is under his thumb.
القسم بأكمله تحت سيطرته.