firm up

verb

Synonyms and Antonyms of FIRM

to become physically firm or solid <wait for the modeling clay to firm up before handling the finished pot>

Synonyms concrete, congeal, firm (up), freeze, indurate, set, solidify

Related 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, temper

Near Antonyms deliquesce, dissolve, flux, fuse, melt, smelt, thaw, unfreeze

Antonyms liquefy (also liquify), soften

What made you want to look up firm[verb]? Please tell us where you read or heard it (including the quote, if possible).

Put-downs with flair

How to use a word that (literally) drives some people nuts.

Test your vocab with our fun, fast game

Ailurophobia, and 9 other unusual fears