To become congealed, solidify.
To change from a liquid to solid state, perhaps due to cold; called to freeze in nontechnical usage.
To coagulate, make curdled or semi-solid such as gel or jelly.
To make rigid or immobile.
To grow (or cause to grow) formulaic and permanent.
To transform (or cause to transform) from a softer animal substance into bone; particularly the processes of growth in humans and animals.
To become (or cause to become) inflexible and rigid in habits or opinions.
To calcify.