From Longman Dictionary of Contemporary Englishin a millionin a millioninformal a) the best of all possible people or things She’s a wife in a million. He’s so generous. He’s one in a million. b) used to show how unlikely something is It was a chance in a million that we’d find a fossil. → million
Examples from the Corpus
a chance in a million• In fact they were saved by a chance in a million.• It was a chance in a million, and if he did not grasp it, one of his competitors would. 