One-trick pony

/wˈɒntɹˈɪk pˈəʊni/

/wˈʌntɹˈɪk pˈoʊni/

[noun]

One-trick pony

[NOUN]

a person or thing that excels at doing only one thing

Examples

1. Tupac Shakur was far from a one-trick pony.

2. It just feels like a really cheap trick on a one-trick pony, and it obviously failed miserably.

3. People come to see me because I can help solve their problems, but I'm kind of a one-trick pony.

4. I mean, it's a one-trick pony that's really, really good at taking whatever data cable you plug into it and say, OK, I'm going to extract the important things out of this.