go back on one's own words
As a Chinese idiom, Pinyin is Z ì sh í Q í y á n, which means that it doesn't count and doesn't keep its promise. From Shangshu Tang Shi.
Analysis of Idioms
[synonym] eat one's words and be fat, break one's promise and be treacherous
The origin of Idioms
"Shangshu · Tang Shi" says: "I believe it, I will not break my promise."
Idiom usage
It's used as predicate, object and attribute. If I come back today to answer the imperial edict, it's time. The second volume of Ming Dynasty Feng Menglong's Xingshi Hengyan.
go back on one's own words
feel very depressed at the prospect - fēng jǔ yún fēi
make no distinction between what 's one 's own and what 's another 's - bù fēn bǐ cǐ