watertight
1 ENTRIES FOUND:
Britannica Dictionary definition of WATERTIGHT
1
:
put or fit together so tightly that water cannot enter or pass through
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The doors/compartments are all watertight.
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a watertight seal
2
:
too strong or effective to fail or to be defeated
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The evidence against the defendant was watertight.
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a watertight alibi/case
