I don't know
As a Chinese idiom, Pinyin is f ǎ NY ǎ Nb ù sh í, which means turning one's face away from others. It describes changing one's attitude and being indifferent to others. From Liu Zihou's epitaph.
Notes on Idioms
Reverse: flip.
The origin of Idioms
Han Yu's epitaph of Liu Zihou in Tang Dynasty: "once you are faced with a small interest, it's just like hair, but if you don't know the opposite eye."
Idiom usage
To change one's attitude. example he often treats people with an attitude that he doesn't know.
I don't know
be able to attain the goal according to schedule - zhǐ rì ér dài