DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   vouch
       v 1: give personal assurance; guarantee; "Will he vouch for me?"
       2: give surety or assume responsibility; "I vouch for the
          quality of my products" [syn: guarantee, vouch]
       3: summon (a vouchee) into court to warrant or defend a title
       4: give supporting evidence; "He vouched his words by his deeds"