1. （潮水或海水）退，落
    When the tide or the sea ebbs, its level gradually falls.

    e.g. When the tide ebbs it's a rock pool inhabited by crustaceans.
           退潮時(shí)，它便成為甲殼動(dòng)物居住的巖石區(qū)潮水潭。

2. 退潮（期）;落潮（期）
    The ebb or the ebb tide is one of the regular periods, usually two per day, when the sea gradually falls to a lower level as the tide moves away from the land.

    e.g. ...the spring ebb tide...
           春季退潮
    e.g. We decided to leave on the ebb at six o'clock next morning.
           我們決定第二天早晨6點(diǎn)鐘趁退潮時(shí)離開(kāi)。

3. 衰退;減退;減弱
    If someone's life, support, or feeling ebbs, it becomes weaker and gradually disappears.

    e.g. ...as a man's physical strength ebbs...
           隨著人體力的衰退
    e.g. Were there occasions when enthusiasm ebbed?
           會(huì)有熱情減退的時(shí)候么？

4. 處于低潮;處于衰退狀態(tài)
    If someone or something is at a low ebb or at their lowest ebb, they are not being very successful or profitable.

    e.g. ...a time when everyone is tired and at a low ebb...
           每個(gè)人都疲憊不堪、處于低潮的一段時(shí)間
    e.g. The Government's popularity is at its lowest ebb.
           政府的支持率跌到了最低點(diǎn)。

5. 起伏;消長(zhǎng)；盛衰
    You can use ebb and flow to describe the way that something repeatedly increases and decreases or rises and falls.

ebb的反義詞

    e.g. ...the ebb and flow of feeling and moods.
           感覺(jué)和情緒的起伏