Noun
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a collateral agreement to answer for the debt of another in case that person defaults
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an unconditional commitment that something will happen or that something is true
"there is no guarantee that they are not lying"
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a written assurance that some product or service will be provided or will meet certain specifications
Verb
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stand behind and guarantee the quality, accuracy, or condition of
"The dealer warrants all the cars he sells"
"I warrant this information"
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promise to do or accomplish
"guarantee to free the prisoners"
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make certain of
"This nest egg will ensure a nice retirement for us"
"Preparation will guarantee success!"
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give surety or assume responsibility
"I vouch for the quality of my products"