ebb

He could feel his strength ebbing (away).

他能感觉到自己逐渐体力不支。

As the tide began to ebb, the beach was revealed, showing the sand and shells underneath.

随着潮水开始退潮，沙滩显露出来，露出了下面的沙子和贝壳。

We'll sail on the ebb.

我们将在退潮时启航。