To make bitter or sour.
To exasperate; to irritate.
Embittered; having a sour disposition or nature.
To clot or coagulate; to cause to congeal, such as through cold. (metaphorically of blood)
To form curds so that it no longer flows smoothly; to cause to form such curds. (usually said of milk)
To cause a liquid to spoil and form clumps so that it no longer flows smoothly