solidify

1 to become physically firm or solid water solidifying into ice Synonyms concrete, congeal, firm (up), freeze, indurate, set, hardenRelated 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

2 to take on a definite form my ideas on this topic are just starting to solidify Synonyms crystallize (also crystalize), jell, shape (up), formRelated Words associate, coalesce, cohere, fuse; combine, conjoin, conjugate, connect, couple, join, link (up), unify, uniteNear Antonyms break down, decay, decompose, disintegrate