Wa·ter-tight a. So tight as to retain, or not to admit, water; not leaky.
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watertight
adj 1: having no leaks [syn: leakproof]
2: not allowing water to pass in or out
3: without flaws or loopholes; "an ironclad contract"; "a
watertight alibi"; "a bulletproof argument" [syn: ironclad,
unassailable, unshakable, bulletproof]