1. able to keep rain out; not allowing rain to pass through

1. to make something able to keep rain out

Examples

• She wore a rainproof jacket during the storm.
• The tent is completely rainproof and will keep you dry.
• We need to rainproof the deck before winter arrives.
• His rainproof boots kept his feet dry all day.
• The company rainproofed the building’s exterior walls.
• Make sure your backpack is rainproof for the hiking trip.