one-trick pony

• one trick pony

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one-trick pony (plural one-trick ponies)

1. A performing animal (especially a pony) that knows only one trick.
2. (idiomatic, by extension) A person or group noteworthy for only a single achievement, skill, or characteristic.
   • 1980, Paul Simon (lyrics and music), “One-Trick Pony”:

     He's a one-trick pony / One trick is all that horse can do / He does one trick only / It's the principal source of his revenue

• one-trick-ponyism

• one-hit wonder