What does 素弦声断 mean?
Literally, It means strings broken so that the sound of 古箏(or 古琴) stopped.

素絃聲斷 comes from a poem. 素絃聲斷 means &quot;It's no longer possible to hear that the beautiful lady plays 古箏(or 古琴) for me again.&quot;


倚危亭。恨如芳草，萋萋剗盡還生。念柳外青驄別後，水邊紅袂分時，愴然暗驚。
無端天與娉婷。夜月一簾幽夢，春風十里柔情。怎奈向、歡娛漸隨流水，素弦聲斷，翠綃香減，那堪片片飛花弄晚，蒙蒙殘雨籠晴。正銷凝。黃鸝又啼數聲。

when you see ancient Chinese dramas, the strings breaks when someone plays 古箏(or 古琴)...It's a sign that something BAD will happen.