lit. the assassin's dagger, concealed in a map scroll, is suddenly revealed when the map is unrolled (referring to the attempted assassination of Ying Zheng 嬴政【YíngZhèng】 by Jing Ke 荆轲【JīngKē】 in 227 BC) (idiom)
lit. the assassin's dagger, concealed in a map scroll, is suddenly revealed when the map is unrolled (referring to the attempted assassination of Ying Zheng 嬴政【YíngZhèng】 by Jing Ke 荆轲【JīngKē】 in 227 BC) (idiom)