Meaning of GUARANTEE in English
1》 a formal assurance that certain conditions will be fulfilled, especially that restitution will be made if a product is not of a specified quality.
2》 something that ensures a particular outcome.
3》 variant spelling of guaranty .
4》 less common term for guarantor .
■ verb ( ~s , ~ing , ~d )
1》 provide a ~: the company ~s to refund your money.
↘provide a ~ for (a product).
↘provide financial security for; underwrite.
2》 promise with certainty.
C17: perh. from Sp. garante , corresp. to Fr. garant (see warrant ), influenced by Fr. garantie 'guaranty'.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004