Word Origin & History
vouchearly 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.