披沥肝胆: open one's heart to a person; be perfectly open and plain; carry [wear] one's heart upon one's sleeve; lay open one's mind; make a clean breast of...; speak one's whole mind
倾吐衷曲: carry [wear] one's heart upon one's sleeve; a heart-to-heart chat [talk]; make a clean breast of; open [uncover] one's heart to; pour out one's heart to; pour out one's thoughts [feelings]
吐露衷曲: outpour one's heart; unbosom oneself; come out with the truth; come out with what is in one's heart of hearts
倾诉衷曲: get sth. off one's chest; pour out one's feelings; pour out one's heart (and soul)