1. not allowing water to enter or pass through

1. to make something unable to be penetrated by water

1. a waterproof garment or material

Examples

• My waterproof jacket kept me dry during the storm.
• The basement walls need to be waterproof to prevent flooding.
• She waterproofed her hiking boots before the camping trip.
• The contractor will waterproof the deck this weekend.
• He packed his waterproofs in case of rain.
• The phone case is completely waterproof up to 30 feet underwater.
• Make sure to waterproof the tent seams before using it.