class act

noun3

1. •
   An excellent performance.

   • Tairawhiti Cultural Development Trust chairman Maui Tangohau said it was a class act by the national champions. — 2017
2. •
   Someone or something who is generally well-mannered, conscientious, etc.

   • You can count on Sam to help out afterwards, he's a real class act.
   • Oh yeah, they're a real class act; they left their garbage all over the grass.
3. •
   Someone or something whose performance is excellent.