1) Impeach 2) To accuse 3) To sue in a court of law 1) Sue 
• (v. t.) To institute and prosecute a suit against, in court; to sue or prosecute at law; hence, to accuse; to impeach. • (v. i.) To sue at law.
Im·plead' intransitive verb To sue at law. Im·plead' transitive verb [ imperfect & past participle Impleaded ; present participle & verbal noun Impleading .] [ Confer Emplead .] (Law) To institute and prosecute a suit against, in court; to sue or prosecute at law; h...
to sue in a court of law. · to bring (a new party) into an action because he or she is or may be liable to the impleading party for all or part of the claim against that party. · to accuse; impeach. · to plead (a suit).