Definition
A crosswind landing condition in which one wing lifts after the wheels are on the runway because the crosswind, striking the upwind side of the airplane, gets under that wing and rolls it upward. If the pilot does not promptly add aileron deflection into the wind to hold the wing down, the airplane can be tipped, weathervaned, or even rolled onto the downwind wing.
Plain English
After your wheels touch down in a crosswind, the wind can suddenly lift the wing on the windward side. You need to keep turning the control wheel into the wind on the rollout to stop that from happening.
Context Anchor
Encountered during crosswind landings, especially just after the main wheels touch down and during the landing roll.
Why Pilots Care
Uncorrected wing rise can cause loss of directional control or a ground loop during the landing rollout.
Grounding Statement
Picture landing in a side wind: if the wind gets under the upwind wing after the wheels are down, that wing can lift unless the pilot holds the controls into the wind.
Intuition Check
Do not assume the landing is finished just because the wheels have touched down. Wing rising after touchdown is a control problem that can happen during the landing roll, while the airplane still needs active control.
Example Sentence 1
During the crosswind landing, the instructor reminded the student to keep adding aileron into the wind on rollout to prevent the wing rising after touchdown.
Example Sentence 2
A sudden gust caused the wing to rise after touchdown until the pilot added more aileron deflection.