verb

make or become dull or less intense.

time dulls the memory

lessen,decrease,diminish,reduce,dampen,depress,take the edge off,blunt,deaden,mute,soften,tone down,allay,ease,soothe,assuage,alleviate,palliate,moderate,mitigate,numb,benumb,desensitize,render insensitive,stupefy,daze,stun,drug,sedate,tranquillize,narcotize,torpefy,obtund,fade,pale,bleach,wash out,decolorize,decolour,dim,etiolate,darken,blacken,blur,veil,obscure,shadow,fog,bedim,put a damper on,cast a pall over,cast down,lower,crush,shake,sap,suppress,extinguish,smother,stifle