a flight maneuver; aircraft slides sideways in the air
move obliquely or sideways, usually in an uncontrolled manner; "the wheels skidded against the sidewalk"
a cross-controlled right-left or left-right application of rudder and aileron that through its lack of coordination uses the side of the aircraft as an air brake
a stabilized maneuver in which the airplane is held with rudder, aileron, and elevator in steady flight with no change in attitude on any flight axis
a turn that is stopped by use of the rudder
a way to lose altitude in a hurry (on purpose), or slide into a final approach during a heavy wind. The technique is to put nearly full rudder in one direction, and then bank in the opposite. This keeps the plane almost level, except pointing to one side -- it looks strange (in a right slip, you are looking at the runway almost out your side window, not the front one, but you're heading for it anyway) but it works.
A yawing of the aircraft toward the outside of the path of a turn. A slipping turn results when horizontal lift is greater than centrifugal force.
A manoevre where an aeroplane pilot rolls the aircraft in one direction with the ailerons and yaws it in the opposite direction with the rudder. This results in the aircraft continuing to move forward but presenting a larger cross-section to the oncoming air - thereby creating drag and causing the aeroplane to lose altitude rapidly in a controlled manner.
A slip is an aerodynamic state where an aircraft is moving sideways as well as forward relative to the oncoming airflow. In other words, for a conventional aircraft, the nose will not be pointing directly into the relative wind. Flying in a slip is aerodynamically inefficient and can also cause motion sickness in passengers.