lessen

lessen verb abate, abbreviate, abridge, abstract, allay, alleviate, assuage, attenuate, bate, belittle, boil down, calumniate, censure, check, compress, condense, contract, curb, curtail, cut, cut down, decimate, decline, decrease, decry, deduct, defame, deflate, degenerate, deliquesce, deminuere, deplete, depreciate, dequantitate, deride, derogate, detract, devaluate, die away, dilute, diminish, discommend, discount, discredit, disparage, dispraise, disvalue, dock, drop off, dull, dwarf, dwindle, ease, ebb, erode, extenuate, imminuere, let up, lighten, lower, malign, melt away, minify, minimize, mitigate, moderate, modulate, palliate, pare, qualify, reduce, remit, run down, set at naught, shorten, shrink, slacken, slight, soothe, speak slightingly, stigmatize, stunt, subdue, subside, subtract, summarize, take away, taper, temper, thin, thin out, traduce, trim, underrate, undervalue, vilify, vilipend, wane, waste away, water down, weaken, wear away, weed out

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See also: abate, abridge, adulterate, allay, alleviate, assuage, attenuate, commute, consume, curtail, debilitate, decrease, deduct, deplete, depreciate, depress, derogate, diminish, discount, ease, erode, expend, extenuate, minimize, mitigate, moderate, modify, mollify, palliate, rebate, reduce, relax, remit, retrench, soothe, subdue, subside