Plain English Meaning
The wheel stops turning but the airplane keeps moving, so the tire slides along the runway like a car skidding when the brakes are slammed on. While it's sliding, that wheel can't steer or slow the airplane normally.
Full Definition
A condition during landing rollout in which a tire stops rotating while the airplane continues to move forward, causing the tire to slide along the runway surface instead of rolling. It typically results from heavy or abrupt braking, especially on wet, icy, or contaminated runways, and produces a loss of directional control and steering authority through that wheel.
Context Anchor
Seen during landing rollouts or rejected takeoffs when heavy braking is used, especially on wet or contaminated runways.