v. i. [ imp. & p. p. Testified p. pr. & vb. n. Testifying ] [ OF. testifier, L. testificari; testis a witness + -ficare (in comp.) to make. See -fy, and cf. Attest, Contest, Detest, Protest, Testament. ] 1. 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. [ 1913 Webster ]

Jesus . . . needed not that any should testify of man, for he knew what was in man. John ii. 25. [ 1913 Webster ]

2. (Law) 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. [ 1913 Webster ]

One witness shall not testify against any person to cause him to die. Num. xxxv. 30. [ 1913 Webster ]

3. To declare a charge; to protest; to give information; to bear witness; -- with against. [ 1913 Webster ]

O Israel, . . . I will testify against thee. Ps. l. 7. [ 1913 Webster ]

I testified against them in the day wherein they sold victuals. Neh. xiii. 15. [ 1913 Webster ]

v. t. 1. To bear witness to; to support the truth of by testimony; to affirm or declare solemny. [ 1913 Webster ]

We speak that we do know, and testify that we have seen; and ye receive not our witness. John iii. 11. [ 1913 Webster ]

2. (Law) To affirm or declare under oath or affirmation before a tribunal, in order to prove some fact. [ 1913 Webster ]

adv. In a testy manner; fretfully; peevishly; with petulance. [ 1913 Webster ]