noun
lungs and liver
Formal or literary term for the lungs and liver as organs. Rare in everyday conversation; more common in medical or classical contexts.
古典医学では、肺肝の調和が健康の鍵とされた。
In classical medicine, harmony between the lungs and liver was considered key to health.
noun
depths of one's heart; innermost heart
Figurative, formal/literary expression for one's deepest feelings or true intentions. Often used in set phrases like 肺肝を披く (to open one's heart) or 肺肝を砕く (to rack one's brains).
彼は友に肺肝を披いて悩みを打ち明けた。
He opened his heart to his friend and confided his troubles.
肺肝を砕いて考えた末、ようやく解決策
After racking his brains, he finally found a solution.