waterproof

Everyday

1. Waterproof means not letting water in or through. tree →
2. A waterproof is a coat that keeps the rain off (UK). tree →
3. To waterproof something means to treat it so water cannot get through. tree →

In the lessons

In science lessons on materials you test which materials are waterproof (plastic, rubber) and which absorb water (paper, cotton). In everyday life you take a waterproof jacket on a hike. Phrases: «waterproof jacket», «waterproof watch», «waterproof boots».

Examples

• Take your waterproof jacket in case it rains. tree →
• We tested which materials are waterproof. tree →
• My watch is waterproof, so I can swim with it. tree →
• Plastic is waterproof but paper is not. tree →
• Wellington boots are waterproof. tree →
• Dad waterproofed the tent before the trip. tree →
• Put on your waterproofs before we go out. tree →

Note

Compare: water-resistant (keeps out a little water) is weaker than waterproof. Ending -proof means «protected against» (fireproof, soundproof, childproof). Waterproof does not mean it floats.