have someone by the balls
US /hæv ˈsʌmˌwʌn baɪ ðə bɔlz/
UK /hæv ˈsʌmˌwʌn baɪ ðə bɔlz/

1.
menguasai seseorang sepenuhnya, memegang seseorang di bawah kawalan
(vulgar slang) to have complete control over someone, especially by having information that could harm them
:
•
The prosecutor really had him by the balls with all the evidence.
Pendakwa raya benar-benar menguasainya dengan semua bukti.
•
If you owe them money, they'll have you by the balls.
Jika anda berhutang wang kepada mereka, mereka akan menguasai anda.