- This coat isn't waterproof, but it is showerproof.
- The material has been treated with resin to make it waterproof.
- These are the electrical connectors, cased in waterproof plastic.
(Definition of “waterproof” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause someone to) be in a position in which the lower part of the body is resting on a seat or other type of support, with the upper part of the body vertical