To cause to assume a crystalline structure or shape; form into crystals: often used figuratively.To change to the state of crystal.To be converted into a crystal; unite, as the separate particles of a substance, and form a regular solid.Figuratively— To assume a definite form and fixity, as an opinion, view, or idea, at first indeterminate or vague; take substantial and definite shape: as, public opinion on this subject is beginning to crystallize.To assume (as a number of opinions, views, or ideas, at first unsettled or diverse) a definite form, and become concentrated upon or collected round a given subject.Also spelled crystallise.