There are 2 main definitions of ringer in English:

ringer1

Syllabification: ring·er
Pronunciation: /ˈriNGər
 
/

noun

1 informal An athlete or horse fraudulently substituted for another in a competition or event.
More example sentences
  • But far from exposing Jeffy once they have discovered his secret, his fellow athletes decide to enlist the ringer in a bid to beat the arrogant champion.
  • Hey, at least he spotted the ringers, which was more than Security did.
  • It didn't take the Army long to figure out that they had a ringer in their midst.
1.1A person’s or thing’s double, especially an impostor: he’s a ringer for the French actor Fernandel
More example sentences
  • Nils Hognestad as Desmond is a bit of a ringer for Prince William and manages an impressive degree of bumbling charisma.
  • Farmiga, a ringer for a young Faye Dunaway, won an acting award at the close of the festival.
  • Would his concentrated attention have anything to do with the fact that she is a striking brunette, considered by some to be a ringer for Monica Lewinsky?
1.2A 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
More example sentences
  • With more teams popping up and ringers being fought over, some sort of order would have to be instituted.
  • I don't really understand how Victory dropped the ball on this one, but I guess they needed to make a bit of money for once and thought it was time to bring in some ringers.
  • In order to win a bet with the rival nuclear facility, he hires several professional baseball players as ringers.
2A person or device that rings something.
More example sentences
  • In the distance, church bells rang out as a team of ringers sought perfection through incessant practise.
  • The ringer is great - very loud and supplemented with a vibrate.
  • It was used for gatherings of staff and family at Christmas and New Year, with traditional entertainments provided by the Ackworth mummers and parish hand-bell ringers.

Definition of ringer in:

There are 2 main definitions of ringer in English:

ringer2

Syllabification: ring·er
Pronunciation: /ˈriNGər
 
/

noun

1In certain games, a tossed object that encircles its intended target, in particular.
1.1A tossed horseshoe that encircles the stake: you never forget the sound of your first ringer
1.2A tossed quoit that encircles the peg.
2A game of marbles in which the target marbles are placed in the center of a circular area.

Definition of ringer in: