verb

(of something unpleasant or severe) become less intense or widespread.

the storm suddenly abated

subside,die away,die down,die out,drop away,drop off,lessen,ease,ease off,let up,decrease,diminish,moderate,decline,fade,dwindle,slacken,recede,cool off,tail off,peter out,taper off,wane,ebb,relent,desist,weaken,become weaker,come to an end