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
to be one 's bosom friend who is actually not
Zhu men stinks of wine and meat, and the road is frozen to death - zhū mén jiǔ ròu chòu,lù yǒu dòng sǐ gǔ
a couple who live from hand to mouth - chái mǐ fū qī
spears of barbed wild grass flourished abundantly - jīng jí cóng shēng
One hundred and eight thousand li - shí wàn bā qiān lǐ