| ̷ ̷ ̷ ̷| ̷ ̷ adjective
Etymology: Middle English water thicht, from water + thicht, thight, tight tight — more at tight
1. : of such precision of construction or fit as to be impermeable to water except when under sufficient pressure to produce structural discontinuity by rupture
a watertight flashing
watertight joints
2. : so devised (as in planning or phrasing) as to leave no possibility of misconstruction or evasion
a watertight lease
the precautions taken against cheating were watertight — A.G.N.Flew
has created a watertight and very real world of his own — C.J.Rolo
• wa·ter·tight·ness noun