This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of ebb.

n. a gradual decline (in size or strength or power or number)

"It was but one sip but it was enough to recall my ebbing life."

flood    flow   

ebbed    ebbing    ebbs   

flowing    flow    fallback    diminution    decline    recede    beleaguer    circumvent    surround    besiege   

ebb-and-flow structure   

tide   

ebb tide    ebb and flow   

decline    decay    recede    lower    withdraw    retire    sink    decrease    wane    receding   

Deb    Jeb    Web    Webb    celeb    deb    web   

eddy    alternation    patter    reiteration    throb    attrition    tide    trickle    cadence    strive