This meaning refers to the process of making a material or substance more solid or rigid, often through chemical processes. It is commonly used in industrial contexts, like chemistry and materials science, particularly in regard to rubber and plastics.

This usage describes a figurative sense of becoming more rigid or inflexible in one’s opinions, attitudes, or behaviors. It often implies a loss of adaptability or compassion in decision-making processes.

This meaning is related to improvements or increases in economic conditions, particularly in the context of market trends, indicating a recovery or positive change.