Synonyms of guarantee

1. guarantee, warrant, warrantee, warranty, assurance, pledge: usage: a written assurance that some product or service will be provided or will meet certain specifications
2. guarantee, assurance, pledge: usage: an unconditional commitment that something will happen or that something is true; "there is no guarantee that they are not lying"
3. guarantee, guaranty, collateral: usage: a collateral agreement to answer for the debt of another in case that person defaults

1. guarantee, vouch, pledge, plight: usage: give surety or assume responsibility; "I vouch for the quality of my products"
2. guarantee, ensure, insure, assure, secure: usage: make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!"
3. undertake, guarantee, promise, assure: usage: promise to do or accomplish; "guarantee to free the prisoners"
4. guarantee, warrant, back, endorse, indorse, plump for, plunk for, support: usage: stand behind and guarantee the quality, accuracy, or condition of; "The dealer warrants all the cars he sells"; "I warrant this information"