to be one 's bosom friend who is actually not
Chinese idiom, Pinyin is mi ù Tu ō zh ī J ǐ, which means pretending to be a close friend. It's from officialdom.
The origin of Idioms
In Chapter 52 of Li Baojia's officialdom, there are friends who play cards and drink together every day
Idiom usage
As a predicate or attribute; used in communication, etc.
Examples
As for weeds, it's hard to say whether it will be done or not. Maybe it won't be done any more, which will save people from trusting their confidants and licking their skin and bones. Lu Xun's the sequel of Huagai's sequel: Maritime Communication
Chinese PinYin : miù tuō zhī jǐ
to be one 's bosom friend who is actually not