verb (used with object)
Examples from the Web for rainproof
Cravenette—Cloths treated and finished before weaving by an improved process which renders them rainproof.Textiles and Clothing|Kate Heintz Watson
A more suitable and rainproof roof could scarcely be designed.
We hasten to the trusty car and are soon ensconced beneath its rainproof coverings.In Unfamiliar England|Thomas Dowler Murphy
No one would cavil at that term as applied to Whitman—yet one must not forget the “rainproof coat.”The Vagabond in Literature|Arthur Rickett
An outer covering that is rainproof and non-absorbent avoids the absorption of water and the consequent increase of weight.Flying the Atlantic in Sixteen Hours|Arthur Whitten Brown