1. (noun) guarantee, warrant, warrantee, warranty
a written assurance that some product or service will be provided or will meet certain specifications
Synonyms: countenance, imprimatur, stock-purchase warrant, indorsement, sanction, guarantee, warrantee, guaranty, endorsement, warranty, warrant, stock warrant
2. (noun) guarantee
an unconditional commitment that something will happen or that something is true
Synonyms: warrantee, warrant, warranty, guaranty
3. (verb) guarantee, guaranty
a collateral agreement to answer for the debt of another in case that person defaults
Synonyms: warrantee, guarantee, warrant, warranty, guaranty
4. (verb) guarantee, vouch
give surety or assume responsibility
Synonyms: vouch, undertake, guarantee, ensure, insure, assure, warrant, secure
5. (verb) guarantee, ensure, insure, assure, secure
make certain of
Synonyms: ensure, reassure, ascertain, batten, control, plug, stop up, warrant, batten down, assure, guarantee, underwrite, fix, cover, promise, fasten, check, see to it, undertake, procure, insure, tell, vouch, secure, see
6. (verb) undertake, guarantee
promise to do or accomplish
Synonyms: take in charge, vouch, tackle, undertake, take on, attempt, set about, guarantee, ensure, insure, contract, assure, warrant, secure
7. (verb) guarantee, warrant
stand behind and guarantee the quality, accuracy, or condition of
Synonyms: vouch, undertake, guarantee, ensure, insure, assure, warrant, secure, justify
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Synonyms and Antonyms of guarantee 
