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 make stronger or more solid.
With respect to debt, to pay off several debts with a single loan.
To combine into a single unit; to group together or join.