Double-edged sword

Meaning

Something that has both advantages and disadvantages.

Usage

Used when a feature brings risks along with benefits.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Swords sharpened on both sides.

Used in military writing before generalizing.