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English definition of “guarantee”

guarantee

noun uk   /ˌɡær.ənˈtiː/ us  
B2 [C or U] a promise that something will be done or will happen, especially a written promise by a company to repair or change a product that develops a fault within a particular period of time: The system costs £99.95 including postage, packing and a twelve-month guarantee. The TV comes with/has a two-year guarantee. a money-back guarantee [+ that] The United Nations has demanded a guarantee from the army that food convoys will not be attacked. [+ (that)] There is no guarantee (that) the discussions will lead to a deal. A product as good as that is a guarantee of commercial success (= it is certain to be successful). The shop said they would replace the television as it was still under guarantee. [C] a formal agreement to take responsibility for something, such as the payment of someone else's debt [C] something valuable that you give to someone temporarily while you do what you promised to do for them, and that they will keep if you fail to do it

guarantee

verb [T] uk   /ˌɡær.ənˈtiː/ us  

guarantee verb [T] (PROMISE)

If a product is guaranteed, the company that made it promises to repair or change it if a fault develops within a particular period of time: The fridge is guaranteed for three years. B2 to promise that something will happen or exist: [+ two objects] European Airlines guarantees its customers top-quality service. The label on this bread says it is guaranteed free of/from preservatives (= it contains no preservatives). If you guarantee someone's debt, you formally promise to accept the responsibility for that debt if the person fails to pay it.

guarantee verb [T] (MAKE CERTAIN)

If something guarantees something else, it makes certain that it will happen: [+ (that)] The £50 deposit guarantees (that) people return the boats after their hour has finished. If something is guaranteed to happen or have a particular result, it is certain that it will happen or have that result: [+ to infinitive] Just looking at a picture of the sea is guaranteed to make me feel sick.
(Definition of guarantee from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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