Origin of groundsheet
Also called ground cloth.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a waterproof rubber, plastic, or polythene sheet placed on the ground in a tent, etc, to keep out damp
a similar sheet put over a sports field to protect it against rain
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