What is the origin of the idiom "one's heart sink" and when to use it?

The phrase "one's heart sink" has been in use since at least the 17th century, and its origin lies in the metaphorical connection between emotions and physical sensations. It is often employed when expectations are shattered, unfavorable news is received, or a realization of an undesirable outcome occurs. This expression can be used in personal narratives, literature, conversations, or everyday language to depict the emotional response to events such as failed plans, unexpected setbacks, or disappointing revelations.