How to Say "to curdle" in Spanish
The Spanish word for “to curdle” is “cortar” — B2 level.
English → SpanishB2
verbB2informal
food, like milk

Examples
Mi hermana y su novio cortaron la semana pasada.
My sister and her boyfriend broke up last week.
Cada vez que habla con ella, se corta y no dice nada.
Every time he talks to her, he gets shy and doesn't say anything.
¡Qué pena! La leche se cortó y ya no sirve.
What a shame! The milk curdled and is no longer usable.
The Reflexive 'Cortarse'
When you use 'cortarse' (with 'me, te, se, nos'), it means the action happens to you internally, usually signifying shyness or embarrassment.
Using 'cortar' transitively for relationships
Mistake: “Decir: 'Yo corté a mi novia.'”
Correction: Always use 'cortar con' when breaking up: 'Corté con mi novia' (I broke up with my girlfriend).
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