Definitions from Wiktionary (heartstring)

▸ noun:  (rare) singular of heartstrings
▸ noun:  (anatomy, historical) A tendon or other structure resembling a cord once thought to be attached to, or to brace, the heart.
▸ noun:  (figurative) A source of one's deepest emotions or inner feelings, especially compassion or love.
▸ noun:  (figurative, archaic) The essential or vital part of something; the core, the essence, the heart.

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