guarantee

guarantee
noun

a formal promise or assurance (typically in writing) that certain conditions will be fulfilled, especially that a product will be repaired or replaced if not of a specified quality and durability
（尤指书面的）保证书；商品保修单
we offer a 10-year guarantee against rusting.
我们提供十年不生锈的保证。
■something that gives a certainty of outcome
起保证作用的事物
supervision can't be a guarantee against a new offence.
监管不能成为不再违法的保证。
■variant spelling of guaranty
同 guaranty
■less common term for guarantor
(较罕)。同 guarantor

(guarantees, guaranteed, guaranteeing)

[no obj.]provide a formal assurance or promise, especially that certain conditions will be fulfilled relating to a product, service, or transaction
作保证（尤指保证与产品、服务或交易相关的某些条件的实现）
[with infinitive]the company guarantees to refund your money.
公司保证退还您的钱。
■[with obj.]provide such an assurance regarding (something, especially a product)
为（某物，尤指产品）保证；保用（产品）
the cooker is guaranteed for five years.
本炊具保用五年。
[as adj. guaranteed]the guaranteed bonus is not very high.
保付的红利并不高。
■[with obj.]provide financial security for; underwrite
为…做经济担保；为…具保
a demand that £100,000 be deposited to guarantee their costs.
为他们的花费支付十万镑定金作担保的要求。
■[with obj.]promise with certainty
确保
no one can guarantee a profit on stocks and shares.
没有人能确保在股票上一定盈利。

语源

late 17th cent. (in the sense 'guarantor'): perhaps from Spanish garante, corresponding to French garant (see warrant), later influenced by French garantie 'guaranty'

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