ringer

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Games A horseshoe or quoit thrown so that it encircles the peg.
2. n. One that rings, especially one that sounds a bell or chime.
3. n. Slang A contestant entered dishonestly into a competition.
4. n. Slang One who bears a striking resemblance to another: a ringer for his father.

Century Dictionary and Cyclopedia

1. n. In quoits, a throw by which the quoit is cast so as to encircle the pin.
2. n. One who rings; specifically, a bell-ringer.
3. n. Any apparatus for ringing chimes, or a bell of any kind.
4. n. In mining, a crowbar.
5. n. In athletics, one who competes in some way under deception, concealing his identity, ability, or standing.
6. n. In racing, a horse entered in a race with intent to deceive.
7. n. In sheep-shearing, one who rings or tops the score. See ring.
8. n. In general, one who excels others, as if able to run rings around his competitors and still keep ahead. See ring.
9. n. A supplementary enthusiastic cheer.
10. n. In telephony, an electric call-ben.

Wiktionary

1. n. Someone who rings, especially a bell ringer.
2. n. games In the game of horseshoes, the event of the horseshoe landing around the pole.
3. n. uncountable, games A game of marbles where players attempt to knock each other's marbles out of a ring drawn on the ground.
4. n. horse racing A horse fraudently entered in a race using the name of another horse.
5. n. sports A person highly proficient at a skill or sport who is brought in, often fraudulently, to supplement a team.
6. n. A person, animal, or entity which resembles another so closely as to be taken for the other; now usually in the phrase dead ringer.
7. n. UK, dialect A top performer.
8. n. Australia The champion shearer of a shearing shed.
9. n. Australia A stockman, a cowboy.

GNU Webster's 1913

1. n. One who, or that which, rings; especially, one who rings chimes on bells.
2. n. (Mining) A crowbar.
3. n. (Horse Racing) A horse that is not entitled to take part in a race, but is fraudulently got into it.

WordNet 3.0

1. n. (horseshoes) the successful throw of a horseshoe or quoit so as to encircle a stake or peg
2. n. a person who rings church bells (as for summoning the congregation)
3. n. a person who is almost identical to another
4. n. a contestant entered in a competition under false pretenses