1.  testify(v = verb.communication) attest, bear witness, take the stand - give testimony in a court of law;
is one way to declare
Derived forms noun testifier₁, noun testimony₃, noun testimony₂, noun testimony₁
Sample sentences: They testify that there was a traffic accident

2.  testify(v = verb.communication) bear witness, evidence, prove, show - provide evidence for; "The blood test showed that he was the father"; "Her behavior testified to her incompetence"
is one way to inform
Derived forms noun testifier₁, noun testimony₃, noun testimony₂
Sample sentences: Somebody ----s something; Something ----s something; Somebody ----s PP; Somebody ----s that CLAUSE

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." [1913 Webster]

2.  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." [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." [1913 Webster]
"I testified against them in the day wherein they sold victuals." [1913 Webster]

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." [1913 Webster]

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

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

testify, v. (-ies, -ied)
1 intr. (of a person or thing) bear witness (testified to the facts).
2 intr. Law give evidence.
3 tr. affirm or declare (testified his regret; testified that she had been present).
4 tr. (of a thing) be evidence of, evince.

Derivative:
testifier n.

Etymology:
ME f. L testificari f. testis witness

VB  be evidence, evince, show, betoken, tell of, indicate, imply, involve, argue, bespeak, breathe, have weight, carry weight, tell, speak volumes, speak for itself, rest upon, depend upon, repose on, bear witness, give evidence, testify, depose, witness, vouch for, sign, seal, undersign, set one's hand and seal, sign and seal, deliver as one's act and deed, certify, attest, acknowledge, make absolute, confirm, prove (demonstrate), indorse, countersign, corroborate, support, ratify, bear out, uphold, warrant, adduce, attest, cite, quote, refer to, appeal to, call, call to witness, bring forward, bring into court, allege, plead, produce witnesses, confront witnesses, place into evidence, mark into evidence, collect evidence, bring together evidence, rake up evidence, experiment, have a case, make out a case, establish, authenticate, substantiate, verify, make good, quote chapter and verse, bring home to, bring to book.

VB  indicate, be the sign, of, denote, betoken, argue, testify, bear the impress, of, connote, connotate, represent, stand for, typify, symbolize, put an indication, put a mark, note, mark, stamp, earmark, blaze, label, ticket, docket, dot, spot, score, dash, trace, chalk, print, imprint, impress, engrave, stereotype, make a sign, signalize, underscore, give a signal, hang out a signal, beckon, nod, wink, glance, leer, nudge, shrug, tip the wink, gesticulate, raise the finger, hold up the finger, raise the hand, hold up the hand, saw the air, suit the action to the word, wave a banner, unfurl a banner, hoist a banner, hang out a banner, wave the hand, wave a kerchief, give the cue, show one's colors, give an alarm, sound an alarm, beat the drum, sound the trumpets, raise a cry, sign, seal, attest, underline, call attention to, give notice.

testify against