Brush hog
（重定向自Bush Hog）
A bush hog is a type of rotary mower. Typically these mowers attach to the back of a farm tractor using the three-point hitch and are driven via the Power take-off (PTO). It has blades that are not rigidly attached to the drive like a lawnmower blade, but are on hinges so if the blade hits a rock or stump, it bounces backward and inward, and then centrifugal force makes it go outwards again.