'dual-edged' originates from the combination of 'dual,' meaning 'two,' and 'edged,' referring to having a sharp side or boundary.

'Dual-edged' evolved from the concept of 'dual' and 'edge,' which have been used in English since the Middle Ages.

Initially, it referred to physical objects with two sharp sides, but now it can also metaphorically describe situations with both positive and negative aspects.