guarantee

Noun
  1. A written assurance that some product or service will be provided or will meet certain specifications (synset 106698201)
  2. An unconditional commitment that something will happen or that something is true (synset 106698919)
    "there is no guarantee that they are not lying"
  3. A collateral agreement to answer for the debt of another in case that person defaults (synset 113374019)
Verb
  1. Give surety or assume responsibility (synset 200891621)
    "I vouch for the quality of my products"
  2. Make certain of (synset 200892111)
    "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
  3. Promise to do or accomplish (synset 200891076)
    "guarantee to free the prisoners"
  4. Stand behind and guarantee the quality, accuracy, or condition of (synset 200893457)
    "The dealer warrants all the cars he sells"; "I warrant this information"

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