披肝瀝膽 [－－沥胆]

Jyutping pei1 gon1 lik6 daam2
Pinyin pī gān lì dǎn

Definitions (CC-CEDICT)
  1. lit. to open one's liver and drip gall (idiom); wholehearted loyalty
Definitions (Wiktionary)
  1. phrase, idiomatic
    to talk without reserve; to have a heart to heart talk