one-trick pony

World English Dictionary
one-trick pony
 
n
informal chiefly (US) a person or thing considered as being limited to only one single talent, capability, quality, etc

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Dictionary.com's 21st Century Lexicon
Main Entry:  one-trick pony
Part of Speech:  n
Definition:  any person or group with only one discernable trait, talent, or area of expertise
Example:  That actor proved to be a one-trick pony.
Etymology:  from act in Cuffling Cousins Circus of mid-1800s
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