1) Agricultural terminology 
Hilling, earthing up or ridging is the technique in agriculture and horticulture of piling soil up around the base of a plant. It can be done by hand (usually using a hoe), or with powered machinery, typically a tractor attachment. Hilling buries the normally above-ground part of the plant, promoting desired growth. This may encourage the developm...
• (n.) The act or process of heaping or drawing earth around plants. • (p. pr. & vb. n.) of Hill
Hill'ing noun The act or process of heaping or drawing earth around plants.