verb

diminish the worth or value of (a quality or achievement).

these quibbles in no way detract from her achievement

belittle,take away from,diminish,reduce,lessen,minimize,lower,make light of,play down,discount,soft-pedal,brush aside,gloss over,trivialize,decry,depreciate,denigrate,devalue,devaluate,deprecate,pooh-pooh,hold cheap,derogate,misprize,minify