1. promising or assuring that something will happen or be provided
Usage: present participle of guarantee
2. providing a formal assurance that a product or service will meet specified standards
Usage: commercial context

Examples

• The company is guaranteeing delivery within 24 hours.
• By guaranteeing quality, the manufacturer builds customer trust.
• The bank is guaranteeing the loan with collateral.
• She’s guaranteeing that the project will be completed on time.
• The warranty is guaranteeing free repairs for two years.
• They’re guaranteeing satisfaction or your money back.