1. a person or thing that declines or refuses something
2. a person or thing that is in decline or decreasing in strength, value, or importance

Examples

• The decliner of the job offer explained that the position did not align with her career goals.
• As a decliner in the market, that company struggled to compete with newer rivals.
• He was known as a decliner of invitations to social events.
• The decliner of the empire faced pressure from multiple external forces.
• Several decliners in the stock index pulled down the overall market performance.