not occur even in a hundred years
A Chinese idiom, Pinyin is B ǎ ini á Nb ù y ù, which means never to be seen in a hundred years and describes rarely seen or appearing. It's from Longxugou.
Analysis of Idioms
Antonym: once in a blue moon
Idiom usage
It is difficult to meet things
Examples
Songhuajiang will never come to wukaijiang, which is once in a hundred years. ——Huacheng, 1981, issue 1
The origin of Idioms
Laoshe's "Longxugou" act 3: "isn't it a meeting? Once in a hundred years, I'll take a half day off to go to a meeting. "
not occur even in a hundred years
make investigations both within and without - nèi chá wài diào
beating drums and blowing trumpets - chuī chuī dǎ dǎ
kindly in appearance but unfathomable at heart - hòu mào shēn wén