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English definition of “guarantee”

guarantee

noun [C/U]  /ˌɡær·ənˈti, ˈɡær·ənˌti/ us  
a promise that something will be done or will happen, esp. a written promise by a company to repair or change a product that develops a fault within a particular period of time: [C] The vacuum cleaner comes with a two-year guarantee. Guarantee is also the state of being certain of a particular result: [U] No matter how many stars you have in the show, there’s no guarantee (= it is not certain that) it will be a success.

guarantee

verb [T]  /ˌɡær·ənˈti, ˈɡær·ənˌti/ us  
If you guarantee something, you promise that a particular thing will happen or exist: [+ (that) clause] I guarantee (you) that our team will play hard and have a shot at winning the championship. If something is guaranteed to happen or have a particular result, it is certain that it will happen or have that result: [+ to infinitive] Eating all that rich food is guaranteed to give you indigestion.
(Definition of guarantee from the Cambridge Academic Content Dictionary © Cambridge University Press)
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