LEARNit Dictionary
one-trick pony
noun
/ˌwʌn trɪk ˈpəʊni/
UK
/ˌwʌn trɪk ˈpəʊni/
US
1
a performer who is only famous for one song, etc.; a person or business that is only good at doing one thing
تکهنر, متخصص یکجانبه