What is another word for "wane"?

Roget's Thesaurus (1911) lists these synonyms for "wane": abate, abatement, abridge, abridgment, and, anticlimax, attenuate, away, bate, coarctation, contract, contraction, crumble, decay, declension, decline, decrease, decreasing, decrement, depreciate, depreciation, dequantitate, descend, descent, deterioration, die, diminish, diminution, discount, drop, dwarf, ebb, extenuate, extenuation, fall, fine, fritter, halo, head, hide.