the line at each end of the field parallel to and not over 25 yards (23 meters) behind the goal line.
Origin of dead-ball line
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
rugby a line not more than 22 metres behind the goal line at each end of the field beyond which the ball is out of play
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012