Information that is widely known, but not acknowledged openly. / (dated) Information that is not widely known, despite being freely available.

(of a sandwich) Composed of a single slice of bread with a topping.

The characteristic of being open-minded.

In an open-minded manner.

Describing a reverberatory furnace used to make steel, usually in mass-produced quantities. / Designating the steel so produced.

(sports) An undefended goal. / An opportunity that is readily available.

(patent law, Japan and South Korea) To publish a patent for initial public review, prior to the formal application for registration. / (transitive) To expose or reveal (something).

present participle of lay open

(idiomatic) With enthusiasm, as if embracing

plural of can-opener