Sudden change of ear
The Chinese idiom, Pinyin is d ù NZ ú Li è ě R, which means to describe the helpless state. From memory.
The origin of Idioms
In the volume of "memoirs" written by Wang Zhen of Song Dynasty, "the Duke of Jin has been waiting for a long time at the gate of the pavilion. Then, suddenly, he said, "it's too late."
Idiom usage
Used as an attribute or adverbial; used of a person's manner.
Sudden change of ear
a book that is shut is but a block - kāi juàn yǒu yì
put a round peg in a square hole - fāng ruì huán záo