Definition of ringer
noun
1 informal an athlete or horse fraudulently substituted for another in a competition or event. a person’s or thing’s double, especially an impostor:he’s a ringer for the French actor Fernandel a person who is highly proficient at a particular skill or sport and is brought in to supplement a team or group of people:league eligibility rules had grown flexible to accommodate new teams, and ringers began suiting up
2a person or device that rings something.
