An underplate is another term for an underdish — the flat plate set beneath a deeper dish at the table. It serves the same purposes: catching spills, protecting the cloth, steadying the dish, and completing the presentation. The word is common in catering and banqueting, where covers are laid by the hundred and every element has its name. Whether called underplate or underdish, it is part of the formal table’s layered logic — each vessel resting on another, each with its role. In grand service the underplate may be silver or charger-sized, becoming a decorative element in its own right rather than a mere functional base.