Meaning

verb give personal assurance; guarantee

verb give surety or assume responsibility

verb summon (a vouchee) into court to warrant or defend a title

originThe verb is derived from Middle English vouchen (“to call, summon; to provide; to make available, proffer; to affirm, declare formally”) [and other forms], from Anglo-Norman vocher, voucher, woucher, and Old French vocher, voucher, vochier (“to call, summon; to claim; to call upon, invoke; to denounce”) [and other forms], from Vulgar Latin *vocicāre, derived from Latin vocāre (“to call, summon;…

Etymology from Wiktionary, CC BY-SA 3.0