披肝沥胆 to bare one's heart; to be utterly loyal
Explanation
比喻真心相见，倾吐心里话。也形容非常忠诚。
It describes showing one's true feelings to others and expressing one's inner thoughts. It also describes being very loyal.
Origin Story
话说东汉末年，天下大乱，群雄逐鹿。关羽，字云长，跟随刘备征战沙场，屡立战功。一次，刘备兵败被曹操俘获，关羽却假意降曹，暗中寻找机会报效刘备。在曹操帐下，关羽始终不忘旧主，披肝沥胆，忠心耿耿，尽心竭力为曹操效劳，但始终对曹操敬而远之，从未有过丝毫的背叛之心。后得知刘备下落后，关羽便义无反顾地离开了曹操，过五关斩六将，千里寻主，最终回到刘备身边，完成了对刘备的承诺。关羽的忠义之举，千古流芳，成为后世忠诚的典范。
In the late Eastern Han Dynasty, the world was in chaos, and the warlords were vying for supremacy. Guan Yu, whose courtesy name was Yunzhang, followed Liu Bei in battles and made numerous contributions. Once, Liu Bei was defeated and captured by Cao Cao, while Guan Yu pretended to surrender to Cao Cao and secretly sought opportunities to serve Liu Bei. Under Cao Cao, Guan Yu never forgot his old master, he was devoted to him and served Cao Cao wholeheartedly without betraying his heart. After learning the whereabouts of Liu Bei, Guan Yu left Cao Cao without hesitation, passed five passes and killed six generals, and finally returned to Liu Bei's side, fulfilling his promise to Liu Bei. Guan Yu's act of loyalty became a model of loyalty for later generations.
Usage
形容对某人或某事非常忠诚，尽心尽力。
To describe being very loyal and devoted to someone or something.
Examples
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他为了朋友，真是披肝沥胆，两肋插刀。
tā wèile péngyou zhēnshi pī gān lì dǎn liǎng lèi chā dāo
He was truly devoted to his friend.
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他披肝沥胆地为公司工作，终于得到了老板的赏识。
tā pī gān lì dǎn de wèi gōngsī gōngzuò zhōngyú dédào le lǎobǎn de shǎngshí
He worked selflessly for the company and finally won the boss's appreciation.
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他披肝沥胆地辅佐皇帝，最终成就了一番伟业。
tā pī gān lì dǎn de fǔzuò huángdì zhōngjiū chéngjiù le yīfān wěiyè
He loyally assisted the emperor and ultimately accomplished a great feat..