groundsheet
nounUK /ˈɡraʊndʃiːt/
US /ˈɡraʊndʃiːt/
A groundsheet is a big piece of cloth or plastic you put on the ground to keep you dry and clean.
We laid a groundsheet under the tent so our sleeping bags would stay dry.
SYNONYMS
OTHER MEANINGS
2. A waterproof sheet spread on the ground inside a tent to protect campers from damp.
The hikers unrolled the groundsheet inside the tent before unpacking their gear.
3. A protective sheet placed under a picnic or outdoor seating area.
She spread the groundsheet on the grass so the children could sit and eat.
4. A large plastic sheet used by builders to cover the ground or protect surfaces.
The painters covered the floor with a groundsheet before starting work.