The term 'TURN SOIL BY MACHINE' can be summarized as the job of rototilling, which is an 8-letter word. Rototilling is a gardening technique that involves using a machine to turn over soil in order to aerate it and prepare it for planting. This process helps to break up compacted soil, remove weeds, and mix organic matter into the soil. Rototilling is often used in vegetable gardens, flower beds, and lawns.