Go to law
Definition 1 of 1
Pro Tip 1/3Legal Disputes
Used when individuals or groups cannot resolve their disagreements privately and seek a court's judgment. 
The neighbors couldn't agree on the property line, so they decided to go to law.
Pro Tip 2/3Last Resort
Implies that other methods of resolution have failed, and legal action is the final step. 
They tried mediation, but ultimately had to go to law to settle the dispute.
Pro Tip 3/3Serious Intent
Indicates a serious commitment to pursue justice or enforcement of rights through the legal system. 
The company was not complying with safety regulations, forcing the employees to go to law.