Synonym word of retrofluxes:

abatement, backflow, decay, decrease, degeneration, depreciation, deterioration, diminution, drop, dwindling, fading away, flagging, going out, lessening, low tide, low water, outward flow, petering out, recession, refluence, reflux, retreat, retrocession, retroflux, shrinkage, sinking, slackening, subsidence, sweep, wane, waning, weakening, withdrawal