sink

abate, de-escalate, diminish, downsize, dwindle, recede, wane

break down, corrupt, decompose, degrade, dilapidate, disintegrate, molder, putrefy

sour, spoil

lessen, lower, reduce

debilitate, undermine

droop, fail, fall, flag, lag, languish, run down, sag, slip, waste (away), weaken, wilt

abate, decrease, de-escalate, die (down), diminish, droop, dwindle, ebb, lessen, let up, moderate, subside, taper off, wane

recede, retreat

blank (out), clear, die (away or down or out), disperse, dissipate, dissolve, dry up

blur, dim

debase, demonetize

underestimate, underprice, underrate, undervalue

abridge, compress, contract, de-escalate, deflate, downsize, dwindle, lessen, moderate, shrink

abash, confound, confuse, discomfit, disconcert, discountenance, embarrass, faze, fluster, mortify, nonplus, rattle

belittle, castigate, criticize, cry down, decry, depreciate, detract, diminish, discount, disparage, minimize, put down, ridicule, write off

bad-mouth, defame, defile, libel, malign, slander

affront, insult

censure, condemn, damn, denounce, execrate, reprehend, reprobate

angle, cant, cock, heel, incline, lean, list, recline, slant, slope, tilt, tip

break down, wear out

yield

degenerate, deteriorate, rot, run down