[1] : The Collaborative International Dictionary of English v.0.48

ebb \ebb\, n. as. ebba; akin to fries. ebba, d. eb, ebbe, dan.
    g. ebbe, sw. ebb, cf. goth. ibuks backward; prob. akin to
   e. even.
   1. the reflux or flowing back of the tide; the return of the
      tidal wave toward the sea; -- opposed to flood; as, the
      boats will go out on the ebb.
      1913 webster

            thou shoreless flood which in thy ebb and flow
            claspest the limits of morality      --shelley.
      1913 webster

   2. the state or time of passing away; a falling from a better
      to a worse state; low state or condition; decline; decay.
      "our ebb of life." --roscommon.
      1913 webster

            painting was then at its lowest ebb.  --dryden.
      1913 webster

   ebb and flow, the alternate ebb and flood of the tide;
      often used figuratively.
      1913 webster

            this alternation between unhealthy activity and
            depression, this ebb and flow of the industrial.
                                                  --a. t.
                                                  hadley.
      1913 webster
see also:
flood ebb and flow 

[2] : Moby Thesaurus II by Grady Ward, 1.0

105 moby thesaurus words for "ebb and flow":
   lissajous figure, alternate, alternation, back and fill,
   back-and-forth, battledore and shuttlecock, be poised, billow,
   break, comb, come and go, coming and going, crash, dash,
   direct tide, ebb, ebb tide, flood, flood tide, flounder, flow,
   fluctuate, flux, flux and reflux, full tide, go through phases,
   heave, high tide, high water, hitch and hike, lift, low tide,
   low water, lunar tide, neap, neap tide, opposite tide, oscillate,
   pass and repass, peak, pendulate, popple, reciprocate,
   reciprocation, refluence, reflux, rhythmic play, ride and tie,
   ring the changes, rip, riptide, rise, rise and fall, roll, scend,
   seesaw, seesawing, send, shift, shuffle, shuttle, shuttlecock,
   sine wave, smash, solar tide, spring tide, stagger, surge, sway,
   swell, swing, teeter, teeter-totter, teeter-tottering, teetering,
   thalassometer, tidal amplitude, tidal current, tidal current chart,
   tidal flow, tidal range, tide, tide chart, tide gate, tide gauge,
   tide race, tide rip, tidewater, tideway, to-and-fro, toss, totter,
   tottering, turn, undulate, ups and downs, vacillate, vary, wave,
   waver, wax and wane, wibble-wabble, wigwag, wobble, zigzag

Ebb >> E Words
Ebb, definition of term: Ebb
ebb_pag1.html

Flow >> F Words
Flow, definition of term: Flow
flow_pag1.html

Flow Chart >> F Words
Flow Chart, definition of term: Flow Chart
flow+chart_pag1.html

Flow Control >> F Words
Flow Control, definition of term: Flow Control
flow+control_pag1.html

Flow Rate >> F Words
Flow Rate, definition of term: Flow Rate
flow+rate_pag1.html

Ebb Tide >> E Words
Ebb Tide, definition of term: Ebb Tide
ebb+tide_pag1.html

Artificial Flow >> A Words
Artificial Flow, definition of term: Artificial Flow
artificial+flow_pag1.html

Data Flow >> D Words
Data Flow, definition of term: Data Flow
data+flow_pag1.html

Data Flow Diagr >> D Words
Data Flow Diagr, definition of term: Data Flow Diagr
data+flow+diagr_pag1.html