(of an edged weapon etc) having two cutting edges / (by extension) having two, often contrasting, meanings or interpretations

(of pages of a book etc) Having gilded edges. / (finance, of securities) Issued by the Bank of England. / Of the highest quality.

(not comparable) Of a blade, such as a sword or knife, sharp on both edges. / (comparable, figuratively) As dangerous for the user as the one it is used on.

simple past tense and past participle of feather edge

Having a thin wirelike thread of metal on the edge of a tool or blade as a result of sharpening.

Edged with teeth, as a saw; serrated.

simple past tense and past participle of re-edge

plural of double-edged sword

Used other than figuratively or idiomatically: see double-edged, sword. / (figuratively) A benefit that is also a liability, or (a benefit) that carries some significant but not-so-obvious cost or risk.

Synonym of double-edged sword: a benefit that is also a liability. / Used other than figuratively or idiomatically: see two, edged, sword.