If something such as a position or opinion solidifies, or if something solidifies it, it becomes firmer and more definite and unlikely to change. Her attitudes solidified through privilege and habit. his attempt to solidify his position as chairman
When a liquid solidifies or is solidified, it changes into a solid. The thicker lava would have taken two weeks to solidify The Energy Department plans to solidify the deadly waste in a high-tech billion-dollar factory. a frying-pan full of solidified fat