to make a solemn declaration, verbal or written, to establish some fact; to give testimony for the purpose of communicating to others a knowledge of something not known to them.-to make a solemn declaration under oath or affirmation, for the purpose of establishing, or making proof of, some fact to a court; to give testimony in a cause depending before a tribunal.-to declare a charge; to protest; to give information; to bear witness; -- with against.-to bear witness to; to support the truth of by testimony; to affirm or declare solemny.-to affirm or declare under oath or affirmation before a tribunal, in order to prove some fact.-in a testy manner; fretfully; peevishly; with petulance.