guarantee

(n) a written assurance that some product or service will be provided or will meet certain specifications warranty, warrantee, warrant,
(n) an unconditional commitment that something will happen or that something is true
- there is no guarantee that they are not lying
(n) a collateral agreement to answer for the debt of another in case that person defaults guaranty,

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

warranty warrantee warrant vouch assure ensure insure secure guaranty undertake

guaranty

guarantor