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1. Give surety or assume responsibility
   - vouch
    
2. Make certain in the future
   "Preparation will guarantee success!";
   - ensure, insure, assure, secure
    
3. Promise to do or accomplish
   "guarantee to free the prisoners";
   - undertake
    
4. Stand behind and guarantee the quality, accuracy, or condition of
   "The dealer guarantees all the cars he sells";
   - warrant

1. A written assurance that some product or service will be provided or will meet certain specifications
   "the ending of guarantee period";
   - warrant, warrantee, warranty
    
2. An unconditional commitment that something will happen or that something is true
   "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
   - guaranty

Derived forms: guarantees, guaranteeing, guaranteed

Type of: assurance, assure, back, collateral, endorse, indorse, pledge, plight [archaic], plump for, plunk for, promise, support

Encyclopedia: Guarantee