The term 'of dirt lump' can be summarized as a CLOD, which is a four-letter word. A CLOD is a lump of soil or clay, usually found in agricultural fields. It is often composed of a mixture of soil, sand, and organic matter, and can range in size from small to large. Clods are formed when the soil is disturbed by plowing, tilling, or other activities. Clods can be broken down into smaller pieces, making them easier to work with.