a white screen set in line with the wicket as an aid to the batsman in seeing the ball when it is bowled.
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British Dictionary definitions for sightscreen
cricket a large white screen placed near the boundary behind the bowler to help the batsman see the ball
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