Definition: The line along each side of the field that marks where the field of play ends.
Examples:
When a player crosses the sideline on a play, they are considered to be out of bounds and the play is marked dead where the ball crossed the line.
About Football Glossary - Sidelines
From James Alder, former About.com Guide
Suggested Reading
Related Searches sideline
Explore Football
Also from About.com:
©2012 About.com. All rights reserved.
A part of The New York Times Company.