1. to promise more than one can deliver or fulfill
Usage: third person singular present

1. promises that exceed what can realistically be delivered
Usage: plural form

Examples

• The politician overpromises during every campaign season.
• She always overpromises to her clients and then struggles to meet deadlines.
• The company’s overpromises led to disappointed customers.
• His overpromises about the project timeline created unrealistic expectations.
• The startup’s overpromises to investors eventually caught up with them.
• Don’t make overpromises you can’t keep.
• The marketing team’s overpromises resulted in a public relations disaster.