in a million

(something) in a million

A person or thing that is the very best or most exemplary of its kind; someone or something that is extremely rare or almost impossible to replicate. Most commonly used in the phrase "one in a million." The field goal, made from 69 yards away, was a kick in a million, and it delivered one of the most thrilling last-minute victories in football history. My mother was a woman in a million, building a business empire from the ground up while simultaneously raising two kids on her own.
See also: million
Farlex Dictionary of Idioms.

a — in a million

one of the very best of their kind.
2002 Infantry Magazine ‘“General Alex” or “The Chief,” as we all knew him,…was a man in a million.’ To be sure, Field Marshal Earl Alexander of Tunis, as he later became known, was one of the outstanding British military commanders of the 20th century.
See also: million
Farlex Partner Idioms Dictionary
See also:
  • (something) in a million
  • (as) rare as hens' teeth
  • a (certain type of person or thing) among (others)
  • type
  • Xs
  • rocking horse manure
  • rocking-horse manure
  • How's this/that for (something)?
  • how's this/that for a...?
  • (as) rare as rocking horse poo