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Meaning of 'Two-edged sword'

What does the saying 'Two-edged sword' mean?

Idiom: Two-edged sword

Meaning:

If someone uses an argument that could both help them and harm them, then they are using a two-edged sword; it cuts both ways.

Country: International English | Subject Area: War, weapons and conflict | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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