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.

present participle of edge

Anything that forms, defines, or marks the edge of something. / (rock climbing) A technique involving the placement of the edge of the climbing shoe on a sharp hold.

Education about human sexual anatomy, reproduction, and intercourse and other human sexual behavior.

A letter written to a newspaper, magazine or other periodical, usually intended for publication, about issues of concern to readers.

The European dormouse, Glis glis, especially when considered as a food

Representing the forefront, or position of greatest advancement in some field.

(transitive, now rare) To direct the course of (a flow, journey etc.); to lead in a particular direction. / (transitive) To infer or deduce (a result, theory etc.) from existing data or premises.

An inference.

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