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Definition of decrease : 1. A becoming less; gradual diminution; decay; as, a decrease of revenue or of strength.
2. The wane of the moon.
3. To cause to grow less; to diminish gradually; as, extravagance decreases one's means.
4. To grow less, - opposed to increase; to be diminished gradually, in size, degree, number, duration, etc., or in strength, quality, or excellence; as, they days decrease in length from June to December.

Synonyms:

flow, pass, mitigate, settle, falling off, decline, reducing, devolve, descend, fall, go down, falloff, come, shine, minify, step-down, hang, return, accrue, light, belittle, slack, simplification, slump, strike, moderate, drop-off, ebb, let up, increase, come down, fall down, precipitate, rebate, cliff

debase, attenuate, sink, depress

fragment, discontinue, reduce, minimize

depreciate, discount, delete, cut, dock, subtract, elide

crop, clip, nip, downgrade, prune, pare, trim, shave, condense, cull, shear, weed, bob, lighten, taper

abatement

divest, dispossess, forfeit, drop, exhaust, lose, dissipate, dissolve, misplace

shrinkage, compression, diminishment, truncation, erosion, lower, dwindle, compaction, shrink, lessen, reduction, subside, recede, diminish, compress, concentration, deduct, shorten, truncate, abbreviation, curtailment, concentrate, abate, die down, deflate, abbreviate, compact, contraction, curtail, deflation, deduction, contract, erode, drain, decrement, abridgement, abridge, deplete, depletion

dispossession, debit, exhaustion, dissolution, forfeiture, expropriation, ruin, loss, deprivation, dissipation, penalty, setback, attrition, divestiture, privation

debasement, diminution, sinking, depression, attenuation

elision, depreciation, lessening, lowering, subtraction, deletion

Usage examples:

• But his despair could not stay the operation of the laws of nature, and he watched the decrease of that water as one watches the failing breath of a dying child. - "Cord and Creese", James de Mille.
• There has been, I was assured by the manager, no sensible decrease in the number of the birds or the eggs during twenty years. - "Northern California, Oregon, and the Sandwich Islands", Charles Nordhoff.
• For this purpose the thermometer must be kept in the bath, and additions of warm water made as the temperature is found to decrease. - "The Maternal Management of Children, in Health and Disease.", Thomas Bull, M.D..