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Definition of watertight adjective from the Oxford Advanced Learner's Dictionary

watertight

adjective
 
/ˈwɔːtətaɪt/
 
/ˈwɔːtərtaɪt/
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  1. that does not allow water to get in or out
    • a watertight container
    • The roof has been made watertight.
    Extra Examples
    • The containers should remain watertight.
    • The trouble is that the inner seal is not completely watertight.
  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.
    • a pretty watertight argument
See watertight in the Oxford Advanced American Dictionary
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noun
 
 
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