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Definitions

guarantee

[gar-uhn-tee] / ˌgær ənˈti /
NOUN
pledge, promise
Synonyms
STRONGEST
agreement assurance certificate collateral contract deposit insurance security warranty
STRONG
attestation bail bargain bond certainty certification charter covenant earnest gage guaranty lock oath pawn pipe recognizance surety testament token undertaking vow warrant word
WEAK
sure thing word of honor
Antonyms
STRONGEST
disagreement uncertainty
STRONG
breach break
VERB
pledge, promise
Synonyms
STRONGEST
assure ensure insure maintain protect prove secure support
STRONG
affirm angel attest aver back bankroll certify confirm cosign endorse evidence evince grubstake guaranty juice mortgage reassure stake swear testify wager warrant witness
WEAK
answer for be surety for bind oneself get behind give bond make bail make certain make sure pick up the check pick up the tab sign for stand behind stand up for vouch for
Antonyms
STRONGEST
harm hurt injure let go neglect
STRONG
contradict deny discourage disprove invalidate oppose refute reject repudiate veto
WEAK
break

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

I guarantee it would be money well spent.

From Los Angeles Times • Apr. 18, 2026

“To be sure, a concession by Iran to guarantee safe passage through the Strait of Hormuz would be meaningful for sentiment and would boost global stocks again as crude-oil prices fell,” he said.

From MarketWatch • Apr. 17, 2026

Meanwhile, Hicham Harb's son Bilal al-Adra said the family considered his extradition illegal and with no guarantee of a fair trial.

From BBC • Apr. 17, 2026

Complicating decisions: Hampshire can’t guarantee partner institutions will honor comparable financial-aid packages.

From The Wall Street Journal • Apr. 16, 2026

This would guarantee sales for the drug companies and motivate them to produce the drugs at cheap prices.

From "Mountains Beyond Mountains" by Tracy Kidder and Michael French

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