Meaning of heartstring | Babel Free

Definitions

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

CEFR level