What is the meaning of Heartstring?

singular of heartstrings

1. A tendon or other structure resembling a cord once thought to be attached to, or to brace, the heart.
2. A source of one's deepest emotions or inner feelings, especially compassion or love.
3. The essential or vital part of something; the core, the essence, the heart.

   A tendon or other structure resembling a cord once thought to be attached to, or to brace, the heart.

   A source of one's deepest emotions or inner feelings, especially compassion or love.

   The essential or vital part of something; the core, the essence, the heart.

   Source: wiktionary.org