The term 'soil-turning farm machine' can be summarized as a PLOW, which is a four-letter word. A PLOW is a tool used in farming to turn over the soil and prepare it for planting. It is usually pulled by a tractor or other vehicle and has a blade that cuts into the soil and turns it over. Plows are used to create furrows, which are shallow trenches in the soil that help to aerate the soil and allow water and nutrients to reach the roots of the plants. Plowing also helps to control weeds and break up hard soil.