琴線

1. Origins, structure, and basic meaning

• Structure: 琴線 (きんせん) is a noun for the heartstrings or a person's deeply responsive emotions.
• Basic usage: In 琴線に触れる, a melody or remark moves someone emotionally.
  • 素朴な旋律が観客の琴線に触れた。 — The simple melody touched the audience's hearts.
  • 子どもの何気ない一言が彼の琴線に触れた。 — The child's casual remark struck a chord with him.

2. Common pitfalls and similar expressions

• Strings and emotional response
  • In this expression, 琴線 figuratively refers to emotional sensitivity rather than literal instrument strings. 琴線に触れる does not mean physically touching a string.