You are a fool of the first water.

你真是个大傻瓜。

youdao

One of the first water clocks was a basin with a small hole near the bottom through which the water dripped out.

最早的水钟之一是一个在底部附近有小洞的水盆，水从这个洞里滴出来。

youdao

This young man had all the inclination to be a profligate of the first water.

这个青年完全有可能成为十足的浪子。

《新英汉大辞典》

Asadi's boat glides through the gap in the dike that brought the first water back into the marshes.

NPR: Iraq's Marshlands Face A Second Death By Drought

An eyewitness working on the west side of Manhattan said the belly of the plane touched the water first.

CNN: Pilot praised for 'masterful' landing

The United Nations General Assembly responded by designating 22 March 1993 as the first World Water Day.

UNESCO: World Water Assessment Programme (WWAP)