Etymology
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voucher (n.)
1520s, originally "summoning of a person into court to warrant the title to a property, a calling to vouch;" see vouch. Meaning "receipt from a business transaction" is first attested 1690s; sense of "document which can be exchanged for goods or services" is attested from 1947.
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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," which is related to vox (genitive vocis) "voice" (from PIE root *wekw- "to speak"). Meaning "guarantee to be true or accurate" is first attested 1590s. Related: Vouched; vouching.

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