Simple Definition of watertight
: put or fit together so tightly that water cannot enter or pass through
: too strong or effective to fail or to be defeated
Full Definition of watertight
1 : of such tight construction or fit as to be impermeable to water except when under sufficient pressure to produce structural discontinuity
2 : leaving no possibility of misconstruction or evasion <a watertight lease>
Examples of watertight in a sentence
The doors are all watertight.
The evidence against the defendant was watertight.
First Known Use of watertight
WATERTIGHT Defined for Kids
Definition of watertight for Students
: so tight as to be waterproof <The pipe's joints are watertight.>
Seen and Heard
What made you want to look up watertight? Please tell us where you read or heard it (including the quote, if possible).