lawsuit /ˈlɔːˌs(j)uːt/noun 1verb 1forms 3 noun1 •In civil law, a case where two or more people disagree and one or more of the parties take the case to a court for resolution.The lawyer advised his client against filing a lawsuit as it would take a lot of time and money to resolve.My ex-fiancé filed a lawsuit against me for a false restraining order and defamation. verb1 •To bring a lawsuit.The master, said Thady, lawsuited against the tenants […] — 1970 formslawsuited · lawsuiting · lawsuits