To vouch for, affirm, or guarantee something in advance; to provide advance testimony or confirmation of something.
From 'fore-' (before) + 'vouch' (to affirm, guarantee). Developed in early modern English legal and commercial language from Old French 'vocher' meaning to call or summon as witness.
In medieval commerce, merchants would 'forevouch' for goods arriving on ships—essentially putting their reputation on the line before delivery, creating a system of trust that made long-distance trade possible before modern communications.
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