watertight/ ˈwɔːtərtaɪt /

1.adjective

防水的,不漏水的

Moss and cloth were laid between the logs to make the walls watertight.
苔藓和布料铺在原木之间,不让墙壁漏水。
2.adjective

严密的,无懈可击的

We had a couple of suspicious characters but their alibis are watertight.
我们中有几位多疑的人,但是他们的阴谋无懈可击。