It means find that part in the heart, tell what it has, and what it is.
Idiom
To say that someone's heart sank suggests:A.) that they started to feel sad or worriedB.) that they felt great discouragement or disappointment
Literally it means that you have a heart, you physically possess that bodily organ.
you have broken somone's heart means to hurt someone feelings.
Unless there is truly something wrong with your heart, then yes, it is an idiom. My heart fell, my heart exploded, my heart sang, my heart doing anything other than pumping blood is an analogy and an idiom.
It means you feel very strong of someone
To say that someone's heart sank suggests:A.) that they started to feel sad or worriedB.) that they felt great discouragement or disappointment
It is not an idiom. Unkindness is often called heartlessness, and so the expression "have a heart" means "Do not be unkind."
It means to feel that there is no way to go on and you just want to give up.
The idiom "made his heart feel heavy" suggests that someone or something has caused emotional pain or sadness. It implies that the person's heart is burdened with negative emotions such as guilt, sorrow, or regret.
"A heart of stone" is a personification.
It is an idiom, because it does not use the term "like" or "as".