"Go to law" is a phrase used to describe the act of taking legal action against someone. This phrase can sometimes come across as aggressive and confrontational, so it's useful to have synonyms at hand for when a more tactful approach is needed. There are many words that can be used in place of "go to law" such as, file a suit, file a lawsuit, bring a claim, initiate legal proceedings, lodge a complaint, take legal action, Sue, prosecute, litigate, and enforce legal rights. Each of these synonyms carries a slightly different connotation and level of formality, so it's important to choose the right phrase for the situation at hand.