nul·lifyBrE/ˈnʌlɪfaɪ/NAmE/ˈnʌlɪfaɪ/verbpresent simple - I / you / we / theynullifyBrE/ˈnʌlɪfaɪ/NAmE/ˈnʌlɪfaɪ/present simple - he / she / itnullifiesBrE/ˈnʌlɪfaɪz/NAmE/ˈnʌlɪfaɪz/past simplenullifiedBrE/ˈnʌlɪfaɪd/NAmE/ˈnʌlɪfaɪd/past participlenullifiedBrE/ˈnʌlɪfaɪd/NAmE/ˈnʌlɪfaɪd/ -ing formnullifyingBrE/ˈnʌlɪfaɪɪŋ/NAmE/ˈnʌlɪfaɪɪŋ/ (formal) ~sthtomakesthsuchasanagreementororderloseitslegalforce使失去法律效力；废止SYNinvalidate◆Judgeswereunwillingtonullifygovernmentdecisions. 法官们不愿废止政府决定。~sthtomakesthloseitseffectorpower使无效；抵消SYNnegate◆Anunhealthydietwillnullifytheeffectsoftraining. 不健康的饮食会抵消锻炼的效果。