tes·ti·fy

[tes-tuh-fahy] verb, tes·ti·fied, tes·ti·fy·ing.
verb (used without object)
1.
to bear witness; give or afford evidence.
2.
Law. to give testimony under oath or solemn affirmation, usually in court.
3.
to make solemn declaration.
verb (used with object)
4.
to bear witness to; affirm as fact or truth; attest.
5.
to give or afford evidence of in any manner.
6.
Law. to state or declare under oath or affirmation, usually in court.
7.
to declare, profess, or acknowledge openly.
00:10
Testify is one of our favorite verbs.
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to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
chat, to converse

Origin:
1350–1400; Middle English testifyen < Latin testificārī to bear witness, equivalent to testi(s) witness + -ficārī -fy

tes·ti·fi·er, noun
pre·tes·ti·fy, verb (used with object), pre·tes·ti·fied, pre·tes·ti·fy·ing.
re·tes·ti·fy, verb, re·tes·ti·fied, re·tes·ti·fy·ing.
un·tes·ti·fy·ing, adjective


5. indicate, show, signify, prove.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
testify (ˈtɛstɪˌfaɪ) [Click for IPA pronunciation guide]
 
vb (when intr, often foll by to) , -fies, -fying, -fied
1.  (when tr, may take a clause as object) to state (something) formally as a declaration of fact: I testify that I know nothing about him
2.  law to declare or give (evidence) under oath, esp in court
3.  to be evidence (of); serve as witness (to): the money testified to his good faith
4.  (tr) to declare or acknowledge openly
 
[C14: from Latin testificārī, from testis witness]
 
testifi'cation
 
n
 
'testifier
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

testify
late 14c., "to serve as evidence of," from L. testificari "bear witness," from testis "witness" (see testament) + root of facere "to make" (see factitious). Biblical sense of "openly profess one's faith and devotion" is attested from 1520s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We thank you again for the opportunity to testify today and look forward to
  working with the committee.
Supporters and detractors were called to testify at a podium a few feet from
  the president.
Photographs and other historical records testify to the former abundance of the
  sea.
Even these simple examples testify to the power of regular expressions.
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