have someone by the balls

US /hæv ˈsʌmˌwʌn baɪ ðə bɔlz/
UK /hæv ˈsʌmˌwʌn baɪ ðə bɔlz/
"have someone by the balls" picture
1.

iemand in zijn macht hebben, iemand bij de ballen hebben

(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.
De aanklager had hem volledig in zijn macht met al het bewijs.
If you owe them money, they'll have you by the balls.
Als je ze geld schuldig bent, hebben ze je in hun macht.