Definition of watertight
- a watertight lease
The doors are all watertight.
The evidence against the defendant was watertight.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'watertight.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: put or fit together so tightly that water cannot enter or pass through
: too strong or effective to fail or to be defeated
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