1. A structure, especially one of masonry, forming the curved, pointed, or flat upper edge of an open space and supporting the weight above it, as in a bridge or doorway. 2. A structure, such as a freestanding monument, shaped like an inverted U. 3. the arch of a raised eyebrow. 4. An organ or structure having a curved or bowlike appearance, especially either of two arched sections of the bony structure of the foot. 5. arch a passageway. 6. To cause to form an arch or similar curve. 7. The dancers alternately arched and hunched their backs. 8. Ralph Waldo Emerson 9. The high fly ball arched toward the stands.
