once-in-a-lifetime chance

once-in-a-lifetime chance

A chance or opportunity afforded to one that is or seems unlikely to ever come about again. This is a once-in-a-lifetime chance to manage our European office in Switzerland, so please think about it. I found myself with the once-in-a-lifetime chance to have dinner with the famous author.
See also: chance

once-in-a-lifetime chance

 and once-in-a-lifetime opportunity
a chance that will never occur again in one's lifetime. This is a once-in-a-lifetime chance. Don't miss it. She offered me a once-in-a-lifetime opportunity, but I turned it down.
See also: chance