vouch for


verb (used without object)
to support as being true, certain, reliable, etc. (usually followed by for ): Her record in office vouches for her integrity.
to attest; guarantee; certify (usually followed by for ): to vouch for someone in a business transaction.
verb (used with object)
to sustain or uphold by, or as if by, practical proof or demonstration.
(formerly) to call or summon (a person) into court to make good a warranty of title.
to adduce or quote in support, as extracts from a book or author; cite in warrant or justification, as authority, instances, facts, etc.
Archaic. to warrant or attest; to support or authenticate with vouchers.
Archaic. to declare as with warrant; vouch for.
Obsolete. to call or take as a witness.
noun Obsolete.
a vouching; an assertion.
a formal attestation; a supporting warrant.

1275–1325; Middle English vouchen < Anglo-French, Middle French vo(u)cher, Old French avochier < Latin advocāre; see advocate

unvouched, adjective
well-vouched, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vouch (vaʊtʃ)
vb (usually foll by for) (when tr, usually takes a clause as object; when intr, usually foll by for)
1.  to give personal assurance; guarantee: I'll vouch for his safety
2.  to furnish supporting evidence (for) or function as proof (of)
3.  (tr) English legal history to summon (a person who had warranted title to land) to defend that title or give up land of equal value
4.  archaic (tr) to cite (authors, principles, etc) in support of something
5.  obsolete (tr) to assert
6.  obsolete the act of vouching; assertion or allegation
[C14: from Old French vocher to summon, ultimately from Latin vocāre to call]

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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Word Origin & History

early 14c., "summon into court to prove a title," from Anglo-Fr. voucher, O.Fr. vocher "to call, summon, invoke, claim," probably from Gallo-Romance *voticare, metathesis of L. vocitare "to call to, summon insistently," frequentative of L. vocare "to call, call upon, summon" (see
voice). Meaning "guarantee to be true or accurate" is first attested 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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