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es alérgico a

is allergic to

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phrase Rare #42,062
is allergic to Can be used literally for allergies or figuratively to mean someone strongly dislikes or avoids something.
SP: Mi sobrino es alérgico a los huevos.
EN: My nephew is allergic to eggs.

Él es alérgico a los medicamentos.

He is allergic to medications.

Mi sobrino es alérgico a los huevos.

My nephew is allergic to eggs.

Tom es alérgico a los gatos.

Tom is allergic to cats.

Él es alérgico a la verdad.

He is allergic to the truth.

Tom no es alérgico a las nueces, pero Mary sí.

Tom isn't allergic to nuts, but Mary is.