[f. CLAMP sb.3] trans. To pile up (bricks, earth, manure, or the like) in a compact heap; to store (potatoes or mangold) in a clamp.
1834. Brit. Husb., I. x. 258. The manure … was piled up … to the height of near 7 feet, when another heap was clamped up.
1851. Mechi, 2nd Paper Brit. Agric., 41. In clamping or earthing large mounds of mangold wurzel.
