ㄆㄡˇㄍㄢㄌㄧˋㄉㄢˇpǒugān‑lìdǎn

剖肝沥胆
pōugān‑lìdǎnㄆㄡ ㄍㄢ ㄌㄧˋ ㄉㄢˇ
  1. 比喻以至相待 剖肝瀝膽報德」。

to be completely honest and sincere (idiom)​