防水シート
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Meanings
1
waterproof sheet; tarpaulin; tarp; flysheet
A sheet of waterproof material used for covering things, camping, or as a tent flysheet. The cross-reference 防水布 is a broader term for waterproof cloth.
See also: 防水布
When I go camping, I make sure to bring a waterproof sheet.
I put a flysheet over the tent to prepare for rain.