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From The Collaborative International Dictionary of English v.0.48:
Vouch \Vouch\, v. t. [imp. & p. p. Vouched; p. pr. & vb. n. Vouching.] [OE. vouchen, OF. vochier to call, fr. L. vocare to call, fr. vox, vocis, voice. See Voice, and cf. Avouch.] [1913 Webster] 1. To call; to summon. [Obs.] [1913 Webster] [They] vouch (as I might say) to their aid the authority of the writers. --Sir T. Elyot. [1913 Webster] 2. To call upon to witness; to obtest. [1913 Webster] Vouch the silent stars and conscious moon. --Dryden. [1913 Webster] 3. To warrant; to maintain by affirmations; to attest; to affirm; to avouch. [1913 Webster] They made him ashamed to vouch the truth of the relation, and afterwards to credit it. --Atterbury. [1913 Webster] 4. To back; to support; to confirm; to establish. [1913 Webster] Me damp horror chilled At such bold words vouched with a deed so bold. --Milton. [1913 Webster] 5. (Law) To call into court to warrant and defend, or to make good a warranty of title. [1913 Webster] He vouches the tenant in tail, who vouches over the common vouchee. --Blackstone. [1913 Webster] Syn: To obtest; declare; affirm; attest; warrant; confirm; asseverate; aver; protest; assure. [1913 Webster]