Curtain, lamp and sword
This is a Chinese idiom. Pinyin is w é ID ē ngqi è Ji à n, which means that the truth is hard to understand, which makes people suspicious. It comes from Huang Xiaoyang's looking back by new Guangdong wusheng in Qing Dynasty.
Idiom explanation
The metaphor is hard to understand and makes people suspicious. It's the same as "curtain lamp box sword".
The origin of Idioms
Huang Xiaoyang's looking back by new Guangdong wusheng in Qing Dynasty: "it's like a curtain and a sword, like a drum in the evening and a bell in the morning. It's vaguely related. It's really difficult for me to understand."
Idiom usage
Used as an object or attribute; used in writing
Curtain, lamp and sword
have a heart-to-heart talk after a long separation - yè yǔ duì chuáng