Plain English Meaning
A safety system that shoves the control yoke or stick forward for you when the airplane is about to stall, forcing the nose down so the wing keeps flying.
Full Definition
An automatic flight control safety device that physically pushes the control column forward when the airplane approaches a stall, lowering the nose to reduce angle of attack and prevent the stall from developing. It activates independently of the pilot, using sensors that detect approaching stall conditions, and applies a strong forward force on the controls.