Not to be caught
Chinese idiom, Pinyin is B ù K ě m ō Zhu ō, meaning that people or things can not be guessed and estimated. It's from the four of Renbu in wuzazu.
The origin of Idioms
In the book of five miscellaneous ancestors, human part four, written by Xie Zhaohe of the Ming Dynasty, it is said that "if you have a toilet, you can't go back by yourself, so you can't catch it."
Idiom usage
As predicate and attribute. It is used for people's temperament and speculation of things.
Analysis of Idioms
Synonym: elusive antonym: clear at a glance
Not to be caught
try by various tricks to find favour with - chuǎi hé féng yíng
change filial obedience into allegiance - yí xiào wéi zhōng