Any dish consisting of only one slice of bread, with any topping.

plural of open secret

(construction) The period of time after an adhesive has been applied and allowed to dry, during which an effective bond can be achieved by joining the two surfaces.

(roofing) a method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the metal valley flashing.

The provision of seating or tables without reservations.

A straight razor.

plural of open razor

(topology) Informally, a set such that the target point of a movement by a small amount in any direction from any point in the set is still in the set; exemplified by a full circle without its boundary.

(literally) Total outdoor sunshine, without clouds, haze, or other obstruction. / (figuratively) Openness, transparency, public awareness.

(idiomatic, often business) To reveal confidential information, especially details of one's business operations.