Etymology
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watertight (adj.)

also water-tight, late 14c., from water (n.1) + tight (adj.). Figurative use from 1640s.

updated on March 23, 2014

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Definitions of watertight from WordNet

watertight (adj.)
not allowing water to pass in or out;
watertight (adj.)
without flaws or loopholes;
a watertight alibi
Synonyms: unassailable / unshakable / bulletproof
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.