披肝沥胆的英文：
[Literal Meaning]
open up/liver/drip/gallbladder
to open up one's heart

[解释]
披：披露；沥：滴。真诚、坦率，用心对待。也形容非常忠诚。

[Explanation]
be loyal and faithful

[例子]
当他遇到真心的朋友时，就会和他们披肝沥胆地交谈。

[Example]
Whenever he met true friends, he would talk to them loyally and faithfully.

[英文等价词]
to hang one's heart on one's sleeve