Wiktionary
n. 1 A double-edged sword; a benefit that is also a liability. 2 (&lit two edged sword English)
Usage examples of "two-edged sword".
I stopped in front of a magnificent Viking figure who held a two-edged sword in his right hand and a buckled shield in his left.
A two-edged sword of the finest Swedish steel, its hilt cut from the twisted horn of some fabulous beast of the northern seas that Brand called a narwhal.
What you've got there is a two-edged sword, not a one-edged billhook.
Even he might be something other than what he believed, his magic the two-edged sword about which his uncle Walker had always warned him.
Two clusters of ringed fingers gripped the hilt of an immense two-edged sword.
It comes to me that justice is a two-edged sword and cuts both ways.
It awakened the desire for progress, and progress was a two-edged sword that, in the wrong hands, could destroy Ne-Issan just as the world of their ancestors had been destroyed.
But it was a two-edged sword because those feelings could overwhelm him if he wasn't careful.