Definition of watertight adjective from the Oxford Advanced American Dictionary

     

    watertight

     adjective
    adjective
    NAmE//ˈwɔt̮ərˌtaɪt//
     
    , NAmE//ˈwɑt̮ərˌtaɪt//
     
     
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  1. 1that does not allow water to get in or out a watertight container The roof has been made watertight.
  2. 2(of an excuse, a plan, an argument, etc.) carefully prepared so that it contains no mistakes, faults, or weaknesses a watertight alibi The case has to be made watertight.
See the Oxford Advanced Learner's Dictionary entry: watertight