take someone to court
US /teɪk ˈsʌmwʌn tə kɔːrt/
UK /teɪk ˈsʌmwʌn tə kɔːrt/

1.
to bring a lawsuit against someone; to sue someone
:
•
My neighbor threatened to take me to court over the fence dispute.
•
If they don't pay, we'll have to take them to court.