From Longman Dictionary of Contemporary Englishnot/never in a million yearsnot/never in a million yearsspokenNEVER used to emphasize that something is impossible or very unlikely to happen She’ll never believe me. Not in a million years. → million
Examples from the Corpus
not/never in a million years• I never would have guessed in a million years!• He was rich as Croesus, something he had never expected to be, not in a million years.• No parent is going to believe this pigtail story, not in a million years.• I still had to find Wally and attempt to explain what I would never in a million years be able to explain.• Never in a million years did I think we'd lose.• It is based on a true story so outrageous that it would never in a million years have passed muster as fiction.• The real reason for her lack of promotion, she knew, would never in a million years occur to him.• You'd never in a million years see a dancing man in a field in the country. 