What is another word for "reflux"?

Roget's Thesaurus (1911) lists these synonyms for "reflux": abate, abatement, abridge, abridgment, action, and, anticlimax, attenuate, away, back, bate, boomerang, bounce, bound, coarctation, coefficient, collision, contract, contraction, contrecoup, crumble, decay, declension, decline, decrease, decreasing, decrement, depreciate, depreciation, dequantitate, descend, descent, deterioration, die, diminish, diminution, direction, discount, drop, dwarf.