double-edged sword
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The “double-edged sword” is a phrase from 15th century English that began as an idiom for someone using an argument that could both help and hurt their position. As with any idiom, there is debate about how the phrase came to be used in this way, but most likely it referred to a weapon that, while deadly to your enemy, was just as deadly to a swordsman using it incorrectly. The idiom has evolved to mean something that “cuts both ways,” or simply, something that has, or can have, both positive and negative consequences.
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