"To provide a guarantee" means to promise or assure someone that something will definitely happen or be done, and if it doesn't, there will be some form of compensation or recourse available. Full definition
There is no guarantee that equities will deliver; they do not provide a guarantee of income or capital. (monevator.com)
Whole life insurance provides guaranteed lifetime life insurance protection and builds cash value inside your policy. (term-life-online.com)
Whole life insurance provides guaranteed death benefit protection for life, guaranteed fixed premiums and guaranteed cash value growth. (termlife2go.com)