watertight
adjective uk/ˈwɔː.tə.taɪt/ us/ˈwɑː.t̬ɚ.taɪt/
(NO WATER)
防水的，水密的;不透水的
having no openings to allow water to get in
They're doing some repairs to make the roof more watertight. 他们在进行一些修理，以加强屋顶的防水性。
(NO DOUBTS)
（理论、计划或协议）严密的，无懈可击的，毫无破绽的
(of a theory, plan, or agreement) formed very carefully in every detail so that nothing is uncertain or in doubt
This book is designed to be provocative rather than a watertight piece of economic analysis. 这本书旨在引发大家辩论，而不是要对经济进行缜密的分析。
(NO GOALS)
UK（足球队防守）滴水不漏
If a football team has a watertight defence, it stops an opponent from scoring a goal.
Rovers' defence will need to be watertight in their Carling Cup clash with Watford. 巡游者队在卡林杯赛上遭遇沃特福德队时防守必须滴水不漏。