Plain English Meaning
The last straight-in part of the landing, flown when the wind is pushing the airplane sideways instead of straight at the nose. The pilot has to adjust the airplane's heading or use a slip so it tracks straight along the runway centerline despite the sideways push.
Full Definition
The final approach segment of a landing flown when the wind is blowing across the runway rather than directly down it, requiring the pilot to compensate for sideways drift while tracking the extended runway centerline.
Context Anchor
Encountered during landing practice and approach-to-landing discussions, especially when the wind is not straight down the runway.