Emily in San Diego, California, wonders about the phrase to dog, meaning “to close and secure” as in to dog a door. In a nautical context, the phrase dog the hatches means to secure them with a bolt or handle designed for that purpose. This phrase probably derives from the idea of securing the hatch as tightly as a tenacious dog locking something in its jaws. To undog a door or hatch is to open it. This is part of a complete episode.