work one's heart out
Chinese idiom, Pinyin is l ì Xu è K ò UX ī n, which means to compare the painstaking. It comes from the order of all vassals.
The origin of Idioms
In the Southern Dynasty, Liang Xiaoyi's "order with all the vassals" said, "it's a pity that we should spare no effort to kowtow to our hearts and try our courage."
Analysis of Idioms
Do your best
Idiom usage
Do one's best
work one's heart out
each trying to cheat or outwit the other - ěr yú wǒ zhà