ebb [eb]

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vi.衰退，减退；n.处于低潮，处于衰退状态

When the sea or tide ebbs, it moves away from the coast and falls to a lower level .

The flood and ebb tides alternates with each other. 涨潮和落潮交替更迭。
They swam till the tide began to ebb. 他们一直游到开始退潮。