break - diminish or discontinue abruptly; "The patient's fever broke last night"

shrivel, shrink - decrease in size, range, or extent; "His earnings shrank"; "My courage shrivelled when I saw the task before me"

taper - diminish gradually; "Interested tapered off"

drop off - fall or diminish; "The number of students in this course dropped off after the first test"

vaporize, vanish, fly - decrease rapidly and disappear; "the money vanished in las Vegas"; "all my stock assets have vaporized"

break - fall sharply; "stock prices broke"

weaken - become weaker; "The prisoner's resistance weakened after seven days"

shrink, contract - become smaller or draw together; "The fabric shrank"; "The balloon shrank"

die away, let up, slack off, abate, slack - become less in amount or intensity; "The storm abated"; "The rain let up after a few hours"

deflate - become deflated or flaccid, as by losing air; "The balloons deflated"

remit - diminish or abate; "The pain finally remitted"

de-escalate - diminish in size, scope, or intensity; "The war of words between them de-escalated with time"

shorten - become short or shorter; "In winter, the days shorten"

thin out - become sparser; "Towards the end of town, the houses thinned out"

wane - decrease in phase; "the moon is waning"

wane - become smaller; "Interest in his novels waned"

decrescendo - grow quieter; "The music decrescendoes here"

alter, change, modify - cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"

suppress - reduce the incidence or severity of or stop; "suppress a yawn"; "this drug can suppress the hemorrhage"

mitigate - make less severe or harsh; "mitigating circumstances"

boil down, concentrate, reduce - cook until very little liquid is left; "The cook reduced the sauce by boiling it for a long time"

shrink, reduce - reduce in size; reduce physically; "Hot water will shrink the sweater"; "Can you shrink this image?"

lour, lower, turn down - make lower or quieter; "turn down the volume of a radio"

de-escalate, step down, weaken - reduce the level or intensity or size or scope of; "de-escalate a crisis"

minimize, minimise - make small or insignificant; "Let's minimize the risk"

cut - have a reducing effect; "This cuts into my earnings"

slack up, slacken, slack, relax - make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now"

diminish, belittle - lessen the authority, dignity, or reputation of; "don't belittle your colleagues"

weaken - become weaker; "The prisoner's resistance weakened after seven days"