diminution

decline decrease reduction step-down

augmentation

change of magnitude decrease decrement statement

alleviation amortisation amortization contraction cut cutback declassification declension decline in quality deduction de-escalation deflation depletion depreciation deterioration detumescence devaluation devitalisation devitalization discount easement easing ebb ebbing erosion extenuation loss lowering minimisation minimization mitigation moderation nosedive palliation price reduction relief reverse split reverse stock split rollback shelter shortening shrinking sinking spell slippage split down subtraction tax credit tax shelter wane weakening worsening