one-trick pony
noun
informal, mainly US
a person or thing considered as being limited to only one single talent, capability, quality, etc
Words nearby one-trick pony
one-tailed,
one-time,
one-to-one,
one-track,
one-track mind,
one-trick pony,
one-two,
one-up,
one-upmanship,
one-way,
one-way mirror