Oxford Dictionary English

    watertight

    adjective
    adjective
    BrE BrE//ˈwɔːtətaɪt//
    ; NAmE NAmE//ˈwɔːtərtaɪt//
    , NAmE//ˈwɑːtərtaɪt//
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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.
    3. Extra examples The containers should remain watertight. The trouble is that the inner seal is not completely watertight. a pretty watertight argument
See watertight in the Oxford Advanced American Dictionary
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