To give personal assurance or guarantee for someone or something; to affirm or attest to the truth, accuracy, or reliability of something based on personal knowledge.
From Old French 'vocher' meaning 'to call upon' or 'to summon as witness', ultimately from Latin 'vocare' (to call). Originally meant to call someone as a witness in legal proceedings, which evolved into the modern sense of personally guaranteeing or confirming something.
When you vouch for someone, you're literally 'calling them as your witness' - putting your own reputation on the line! The legal origins show why vouching is so serious: in medieval courts, calling someone as a witness meant you trusted them completely, and if they lied, your credibility was damaged too.
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