ebb suggests the receding of something (such as the tide) that commonly comes and goes.

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In an Earthquake Brace + Bolt (EBB) seismic retrofit, the foundation is "bolted" to the frame of the house, and when there are walls called "cripple walls" in the crawl space under the house, …

Idiom ebb and flow (Definition of ebb from the Cambridge Academic Content Dictionary © Cambridge University Press)

noun the flowing back of the tide as the water returns to the sea (flood, flow ). a flowing backward or away; decline or decay. the ebb of a once great nation. a point of decline. His fortunes were …

Definition of ebb noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

ebb verb [I] (FEELING) If a physical or emotional feeling ebbs, it becomes less strong or disappears:

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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. ...the spring ebb tide. We decided …

When something ebbs, it is declining, falling, or flowing away. The best time to look for sea creatures in tidal pools is when the tide is on the ebb — meaning it has receded from the shore.