The antonyms for the phrase "turned to liquid" could include phrases such as solidified, congealed, or coagulated. These words describe the process of a liquid becoming thicker, compact, or hardened. When a liquid solidifies, it becomes less malleable and more rigid. This can happen due to a variety of reasons, such as changes in temperature or pressure. For instance, when water freezes, it solidifies and becomes ice. Similarly, when a sauce or gravy is left out for too long, it can congeal and lose its smooth consistency. The antonyms for "turned to liquid" therefore illuminate the opposite process of making a substance more solid or viscous.