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Definition of testify : 1. In a testy manner; fretfully; peevishly; with petulance.
2. To affirm or declare under oath or affirmation before a tribunal, in order to prove some fact.
3. To bear witness to; to support the truth of by testimony; to affirm or declare solemny.
4. To declare a charge; to protest; to give information; to bear witness; - with against.
5. 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.
6. 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.

Synonyms:

record, take the stand, knowledge, turn out, leaven, depone, show up, test, bear out, try, bear witness, own, back, evidence, show, present, mark, designate, law, depict, register, render, point to, argue, stand up for, shew, try out, turn up, usher, examine, avow, true, point, rise, picture, demo, swear, protest, justify, bespeak, raise, tell, read, essay

proclaim, pronounce, accept, propound, maintain, validate, claim, avouch, admit, corroborate, profess, contend, endorse, express, support, state, declare, assure, warrant, verify, certify, acknowledge, sustain, adjure, approve, affirm, submit, pledge, set down, aver, attest, promise, assert, ratify

establish, witness, indicate, exemplify, prove, demonstrate, adduce, exhibit, depose, authenticate, illustrate, confirm, determine, betoken, observe, substantiate, vouch, connote, manifest, evince, document

communicate, uncloak, advertise, confess, disclose, brief, unmask, broadcast, reveal, disseminate, divulge, announce

Usage examples:

• Few of my readers will fail to testify that the sweetest pleasures are those which are hardest to be won, and that the prize, to obtain which one would risk one's life, would often pass unnoticed if it were freely offered without difficulty or hazard. - "The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons", Jacques Casanova de Seingalt.
• To see the tact, patience and perseverance of these " Slum Angels" as they are often called, is a divine object lesson in itself, and much of their work is not done in vain, as many would testify. - "The Social Work of the Salvation Army", Edwin Gifford Lamb.
• But, raised from the dead, from awful and desert dreams that these lips never dare reveal- recalled upon earth, to testify the powers of Heaven- once more mortal, the witness of immortality; I drew a new being from the grave. - "The Last Days of Pompeii", Edward George Bulwer-Lytton.