• n. 衰退；退潮；衰落
• vi. 衰退；减少；衰落；潮退

来自PIE*apo-, 离开，词源同apo-, apogee.

ebb

ebb: [OE] Water that is ebbing is literally going ‘off’ or ‘away’. The word comes from West Germanic *abjon, a noun formed from *ab, ancestor of modern English of, off, which denoted removal or departure.
=> of, off

ebb (n.)

Old English ebba "falling of the tide, low tide," perhaps from Proto-Germanic *af- (cognates: Old Frisian ebba, Old Saxon ebbiunga, Middle Dutch ebbe, Dutch eb, German Ebbe), from PIE root *apo- "off, away" (see apo-). Figurative sense of "decline, decay, gradual diminution" is from late 14c. Ebb-tide is from 1776.

ebb (v.)

Old English ebbian "flow back, subside," from the root of ebb (n.). Figurative use in late Old English. Related: Ebbed; ebbing.

1. We decided to leave on the ebb at six o'clock next morning.

我们决定第二天早晨6点钟趁退潮时离开。

来自柯林斯例句

2. The Government's popularity is at its lowest ebb.

政府的支持率跌到了最低点。

来自柯林斯例句

3. the ebb and flow of the tide

海潮的涨落

来自《权威词典》

4. Private and public virtues were at the lowest ebb.

公德与私德均在衰落之中.

来自《简明英汉词典》

5. The flood and ebb tides alternates with each other.

涨潮和落潮交替更迭.

来自《现代汉英综合大词典》