two-edged sword

and double-edged sword

Fig. something that offers both a good and bad consequence. The ability to get your insurance to pay for it is a double-edged sword. They may raise your rates. Her authority in the company is a two-edged sword. She makes more enemies than allies.

Common Names:

Name	Pronounced	Usage
Lylou	lee-LOO	French
Doe	[dəu]
Giosetta	jo-ZET-tah	Italian
Edmund	ED-mənd (English), ED-muwnt (German, Polish)	English, German, Polish
Johnson	['dʒɔnsn]
Cato (2)	-	Dutch