noun
heartstrings; deepest emotions
Figurative use, often in the phrase 琴線に触れる (to touch one's heartstrings). Refers to something that deeply moves or resonates with a person.
彼の演奏は聴く人の琴線に触れた。
His performance touched the heartstrings of the listeners.
その映画のラストシーンは、多くの人の琴線に触れるだろう。
The final scene of that movie will probably touch many people's heartstrings.
noun
koto string
Original literal meaning: the string of a koto (Japanese zither). Now rare outside historical or musical contexts.
See also: 琴 (こと)
琴線は、もともと琴の糸を指す言葉だった。
琴線 originally referred to the strings of a koto.