BELT UP Antonyms There are 5 antonyms of the phrase belt up. (opposite meanings)Did you mean?Definition of BELT UPBest Opposite Words For BELT UPTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1decreaseverbv2loosenverbv3unbuckleverbv4unfastenverbv5untieverbv Alternatives for DECREASE Words (27)lessenabatediminishlowerreduceshrinkcontractcurtaildownsizedwindleminimizedecrementfallreductioncutdiminutiondropdrop-offlesseninglossloweringminifyplummetplungeshrinkagesinkstep-downPhrases (1)go downOpposite words for decrease Alternatives for LOOSEN Words (13)relaxundoreleaseunfastenuntieslackenunbindunlooseunlatcheaseliberatelooseteasePhrases (4)let output outset freetease apartOpposite words for loosen Alternatives for UNBUCKLE Words (3)unclaspunfastenunlockOpposite words for unbuckle Alternatives for UNFASTEN Words (13)undoloosenreleaseunbuckleunbuttonunclipuncorkunhookunlockunsealunstrapuntieunlatchOpposite words for unfasten Alternatives for UNTIE Words (18)loosenundounlacedetachreleaseunbindunbuckleunbuttonunclaspunfastenunhookunlashunsealunstrapunwrapunyokeunlatchunbraceOpposite words for untie