Aggressive Cut

This is where the cutting edge of a bottom blade is located slightly forward of the central axis of a cylinder, on a cylinder mower. This results in a less upright grass blade being cut at the point of being sheared by the cylinder and bottom blade edge coming together.
The nearer the cutting edge of the bottom blade is located vertically beneath the central axis of the cylinder, the less aggressive the cut: The cutting action is being carried out on a more upright grass blade.