From King Dictionary of Contemporary English waterproof wa‧ter‧proof 1 / ˈwɔːtəpruːf $ ˈwɒːtər-, ˈwɑː- / adjective WATER not allowing water to enter a waterproof jacket waterproof adhesive Rub the wax in to make the shoe waterproof. — waterproof verb [transitive ] Plastic sheeting was used to waterproof the shed. — waterproofed adjective [only before noun ] a waterproofed sack Examples from the Corpus waterproof • The Gore-tex fabric manages to be completely waterproof, and yet allows body moisture to escape. • A warm, waterproof jacket is the first thing you need for mountain walking. • a waterproof tent • a waterproof watch make ... waterproof • PU-coated leather: a cheaper, lightweight leather which is given a polyurethane coating to make it more waterproof. • Should I coat the brickwork and mortar to make them waterproof? • Gore-Tex: microporous membrane, glued to various fabrics making them waterproof and breathable. • The sturdy frame has a special protection to make it waterproof and the cushions are covered in a charming songbird design fabric. • The bike was sealed to make it waterproof and tracks were laid down under the water for it. • Then make it waterproof by sealing all the internal corners with a bead of silicone sealer, spread with a wet thumb. • A strong board with notices covered with cling film to make them waterproof catch people's attention. • Flashing is a plastic or rubber sheeting material that makes a waterproof layer between certain surfaces in the wall. waterproof waterproof 2 noun [countable usually plural ] DCC WATER a jacket or coat that does not allow rain and water through it waterproofs (=a waterproof jacket and trousers ) Examples from the Corpus waterproof • As a waterproof it was next to useless. • She began to reproach her husband for his carelessness: Why did he insist on going out without his waterproof?