雨あま蓋ぶた

noun

rain cover; rain fly

Specifically the waterproof outer layer of a tent or backpack, designed to keep rain out.

• テントの雨あま蓋ぶたをしっかり張はって、雨あめに備そなえた。

  I set up the tent's rain fly securely to prepare for rain.

noun

pocket flap

The flap that covers a pocket opening, often on outdoor or military clothing, to keep rain out.

• このジャケットの胸むねポケットには雨あま蓋ぶたが付ついている。

  This jacket has a flap over the chest pocket.