GNU Collaborative International Dictionary of English

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Found one definition

1.       
   onside kick (Football) A kickoff in which the kicking team attempts to kick the ball only so far as is legally required (beyond the 50-yard line), so as to have a better chance to recover the kicked ball itself; -- it is a risky type of play used only when the kicking team is losing and there is little time left to play.
   
   [PJC]