double-edged

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double-edged (comparative more double-edged, superlative most double-edged)

1. (not comparable) Of a blade, such as a sword or knife, sharp on both edges.

   Coordinate term: single-edged

2. (comparable, figuratively) Beneficial and harmful at the same time; assisting or contributing in one manner while also creating risk or negative consequences.

   Slander is a double-edged weapon: you can hurt the reputation of another but it diminishes your own reputation that you debase yourself so much.