General Definition: 1. Of two things that are flat, to go up and down in parallel with each other, or any thing or any action that can be reasonably associated with this in a given context. Without context, most signers would assume it refers to toast in a toaster. As a Noun: 1. A piece of electrical equipment which you use to toast bread, especially one in which the toast pops up automatically when cooked. English = toaster.