watertight Definition in the Cambridge English Dictionary
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Definition of “watertight” - English Dictionary

Definition of "watertight" - American English Dictionary

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watertightadjective

 us   /ˈwɔ·t̬ərˌtɑɪt, ˈwɑt̬·ər-/
having no ​openings to ​allow the ​passage of ​water: They’re doing some ​repairs on the ​church to make the ​roof watertight.
(Definition of watertight from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "watertight" - British English Dictionary

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watertightadjective

uk   /ˈwɔː.tə.taɪt/  us   /ˈwɑː.t̬ɚ-/

watertight adjective (NO WATER)

having no ​openings to ​allowwater to get in: They're doing some ​repairs to make the ​roof more watertight.

watertight adjective (NO DOUBTS)

(of a ​theory, ​plan, or ​agreement) ​formed very ​carefully in every ​detail so that nothing is ​uncertain or in ​doubt: This ​book is ​designed to be ​provocativerather than a watertight ​piece of ​economicanalysis.

watertight adjective (NO GOALS)

UK If a ​footballteam has a watertight defence, it ​stops an ​opponent from ​scoring a ​goal. : Rovers' ​defence will need to be watertight in ​their Carling Cup ​clash with Watford.
(Definition of watertight from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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