To sue (a third party) in a lawsuit that has already been commenced as a defendant who may be liable for the claim that is the subject of the suit.
To sue or prosecute by judicial proceedings: as, the corporation shall have power to plead and be impleaded.
To impeach; accuse.transitive verb
To institute and prosecute a suit against, in court; to sue or prosecute at law; hence, to accuse; to impeach.intransitive verb
To sue at law.verb