waterproof

US /ˈwɑː.t̬ɚ.pruːf/
UK /ˈwɑː.t̬ɚ.pruːf/
"waterproof" picture
1.

impervious to water

:
This jacket is completely waterproof, so you'll stay dry in the rain.
Make sure your phone is waterproof before taking it near the pool.
1.

to make something impervious to water

:
We need to waterproof the roof before winter.
The company specializes in products that waterproof outdoor gear.