institute legal proceedings against; file a suit against; "He was warned that the district attorney would process him"; "She actioned the company for discrimination"
To litigate means to take legal action. the cost of litigating personal injury claims in the county court If we have to litigate, we will. to take a claim or complaint against someone to a court of law (past participle of litigare, from lis + agere )
To make the subject of a lawsuit; to contest in law; to prosecute or defend by pleadings, exhibition of evidence, and judicial debate in a court; as, to litigate a cause