1. sells something at a lower price than a competitor
Usage: third person singular present tense
2. presents or promotes something as less valuable or impressive than it actually is
Usage: third person singular present tense

Examples

• The discount store undersells its competitors by 20 percent.
• She always undersells her achievements in job interviews.
• This company undersells similar products in the market.
• He undersells his artistic talent when talking to others.
• The new retailer undersells established brands consistently.
• Don’t undersell your experience on your resume.