watertight

water|tight /w'ɔːtərtaɪt/
also water-tight
1 [ADJ]
Something that is watertight does not allow water to pass through it, for example because it is tightly sealed.
The flask is completely watertight, even when laid on its side...
2 [ADJ]
A watertight case, argument, or agreement is one that has been so carefully put together that nobody will be able to find a fault in it.
The police had a watertight case. They even got his fingerprints from that glass cabinet.

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