vouch

Verb
  1. Give personal assurance;
    Guarantee (synset 201017113)
    "Will he vouch for me?"
  2. Give surety or assume responsibility (synset 200891621)
    "I vouch for the quality of my products"
  3. Summon (a vouchee) into court to warrant or defend a title (synset 200793827)
  4. Give supporting evidence (synset 200223676)
    "He vouched his words by his deeds"

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