To cause a liquid to spoil and form clumps so that it no longer flows smoothly
To form curds so that it no longer flows smoothly; to cause to form such curds. (usually said of milk)
To clot or coagulate; to cause to congeal, such as through cold. (metaphorically of blood)
To convert into glass or a glass-like substance by heat and fusion.
To be converted into glass, especially through heat.