a double-edged sword

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double-edged sword

Something that can be both beneficial and problematic. Going back to school was a double-edged sword for Pam. On the one hand, it would widen her career prospects, but, on the other hand, she would be in a lot of debt when she graduated.
See also: sword

a double-edged sword

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a two-edged sword

COMMON If something is a double-edged sword or a two-edged sword, it has both an advantage and a disadvantage. The strong yen is a double-edged sword for Japan. It increases the spending power of consumers, but it also raises the costs of exports for manufacturers. Fame is a two-edged sword bringing as many problems as it does privileges.
See also: sword