heartstring

"Heartstring" is a figurative noun for a person's deepest and most tender feelings. It suggests an inner emotional tie that can be touched, stirred, or sharply moved by stories, music, memories, or real-life events. In modern English, the word is far more common in the plural form, heartstrings, especially in expressions such as pull at someone's heartstrings or tug at someone's heartstrings.

When something pulls at your heartstrings, it causes a strong emotional reaction. Often that reaction involves sympathy, sadness, love, pity, or warm affection, but it can also come from joy or deep personal feeling. A charity appeal may try to pull at people's heartstrings. A song about childhood may tug at them. A kind act, a reunion, or even a simple photo can do the same.

The image comes from an old belief that the heart held the emotions and that those emotions were tied to it by strings. The belief itself was mistaken, but the metaphor survived because it is vivid and easy to feel. It makes emotion seem physical, as if the right word, sound, or memory could pluck something hidden inside you.

Although the singular form exists, you will usually meet the word as part of the plural phrase rather than by itself. In use, it often carries a slightly sentimental tone and is common when speaking about emotional appeals, moving art, family stories, loss, kindness, and anything else that reaches a person at a deep emotional level.