Synonyms and Antonyms of firm up
to become physically firm or solid wait for the modeling clay to firm up before handling the finished pot Synonyms concrete, congeal, harden (up), freeze, indurate, set, solidifyRelated Words cake, callus, encrust (also incrust); clot, coagulate, gel, gelate, gelatinize, jell, jelly, stiffen, thicken; calcify, crystallize (also crystalize), ossify, petrify, rigidify; anneal, case-harden, temperNear Antonyms deliquesce, dissolve, flux, fuse, melt, smelt, thaw, unfreezeAntonyms liquefy (also liquify), soften
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