(idiom) extremely rare; once in a thousand years. Describes an opportunity that is very difficult to come by, usually referring to a positive event. See also [[百年不遇|百年不遇|bai3 nian2 bu4 yu4]].

the opportunity of a thousand years; a very rare and precious chance

happening only once in a thousand years; used to describe an extremely rare opportunity

unmatched for a thousand years; extremely rare; unique since ancient times