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comparative more watertight, superlative most watertight
So tightly made that water cannot enter or escape. examples
(figurative) So devised or planned as to be impossible to defeat, evade or nullify. quotations examples
What if England's defence is finally examined to the full by class opposition at the Euros? Can this rearguard be trusted to remain watertight and protect what a high-quality attack can give them?
2021 March 31, Phil McNulty, “England 2-1 Poland: What shape are Gareth Southgate's side in?”, in BBC Sport