waterproof - definition and synonyms

verb [transitive] 

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/ˈwɔːtə(r)ˌpruːf/
present tense
I/you/we/theywaterproof
he/she/itwaterproofs
present participlewaterproofing
past tensewaterproofed
past participlewaterproofed
  1. to make clothes or other things waterproof