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vouch (v.)

early 14c., "summon into court to prove a title," from Anglo-French voucher, Old French vocher "to call, summon, invoke, claim," probably from Gallo-Roman *voticare, metathesis of Latin vocitare "to call to, summon insistently," frequentative of Latin vocare "to call, call upon, summon" (from PIE root *wekw- "to speak"). Meaning "guarantee to be true or accurate" is first attested 1590s. Related: Vouched; vouching.

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Definitions of vouch from WordNet

vouch (v.)
give personal assurance; guarantee;
Will he vouch for me?
vouch (v.)
give surety or assume responsibility;
I vouch for the quality of my products
Synonyms: guarantee
vouch (v.)
summon (a vouchee) into court to warrant or defend a title;
vouch (v.)
give supporting evidence;
He vouched his words by his deeds
From wordnet.princeton.edu