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
Glass	[glɑ:s]
Sophronia	-	Literature, Late Greek
Dye	[dɑi]
Eavan	EE-van	Irish
Acland	['æklənd]
Masuyo	mah-soo-yo	Japanese