Definition of Water-tight

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Water-tight Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
So tight as to retain, or not to admit, water; not leaky.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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water-tight
water-wash v : wash with water

Water-tight Definition from Sports Dictionaries & Glossaries
maritime&shipping&trade
The state of a ship when not leaky.