To form curds so that it no longer flows smoothly; to cause to form such curds. (usually said of milk) Example: Too much lemon will curdle the milk in your tea.
To clot or coagulate; to cause to congeal, such as through cold. (metaphorically of blood)
To cause a liquid to spoil and form clumps so that it no longer flows smoothly
All clues having "CURDLE"
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