Plain English Meaning
Using the control wheel and the rudder pedals together so the airplane turns smoothly, without sliding sideways through the air.
Full Definition
The simultaneous, matched application of aileron and rudder inputs during a turn so that the airplane rolls into and out of the bank without slipping or skidding. The ailerons set the bank angle while the rudder offsets the adverse yaw produced by the ailerons, keeping the airplane's longitudinal axis aligned with the flight path.
Context Anchor
You use this during , turns, and small corrections whenever control wheel or movement needs .