The meaning of WATERTIGHT is of such tight construction or fit as to be impermeable to water except when under sufficient pressure to produce structural discontinuity.

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watertight adjective (NO DOUBTS) (of a theory, plan, or agreement) formed very carefully in every detail so that nothing is uncertain or in doubt:

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. The batteries are …

Definition of watertight adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1. So tightly made that water cannot enter or escape. 2. Having no flaws or loopholes; impossible to fault, refute, or evade: a watertight alibi; a watertight contract.

wa•ter•tight (wô′ tər tīt′, wot′ ər-), adj. constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments. so devised or planned as to be impossible to …