Verb

• S: (v) guarantee, vouch (give surety or assume responsibility) "I vouch for the quality of my products"
• S: (v) guarantee, ensure, insure, assure, secure (make certain of) "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
• S: (v) undertake, guarantee (promise to do or accomplish) "guarantee to free the prisoners"
• S: (v) guarantee, warrant (stand behind and guarantee the quality, accuracy, or condition of) "The dealer warrants all the cars he sells"; "I warrant this information"