decrease

> decrease
(verb)
abate, contract, decline, diminish, dwindle, ebb, lessen, subside, wane.
curtail, diminish, lessen, lower, reduce, retrench.

> decrease
(noun)
abatement, contraction, declension, decline, decrement, diminishing, diminution, ebb, ebbing, lessening, reduction, subsidence, waning.