Webster's English Dictionary

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vouch

1. vouch \'vau.ch\ vb [ME vochen, vouchen, fr. MF vocher, fr. L vocare to 
   cal]l, summon, fr. voc-, vox voice - more at VOICE 1: to summon into court 
   to warrant or defend a title  archaic  2a: ASSERT, AFFIRM  2b: ATTEST  
   archaic  3: to cite or refer to as authority or supporting evidence  4a: 
   PROVE, SUBSTANTIATE  4b: to verify (a business transaction) by examining 
   documentary evidence  1: to give a guarantee : become surety  2a: to supply 
   supporting evidence or testimony  2b: to give personal assurance 
2. vouch n obs  : ALLEGATION, DECLARATION