onside kick definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Football a kickoff that is deliberately kicked short in the hope that the kicking team can get possession of the ball
onside kick definition by American Heritage Dictionary
A kickoff in which the ball carries just far enough, at least ten yards, to be recovered legally by the kicking team.