How to Say "shudder" in Spanish
The Spanish word for “shudder” is “escalofrío” — A2 level. This is a very common word in everyday Spanish.

Examples
Tengo escalofríos por la fiebre.
I have the chills because of the fever.
Sentí un escalofrío cuando se abrió la puerta sola.
I felt a shiver when the door opened by itself.
La música era tan hermosa que me dio un escalofrío.
The music was so beautiful that it gave me a shiver.
Using it with 'Dar'
To say something 'gives you the chills,' use the verb 'dar' followed by the person it affects: 'Me da escalofríos' (It gives me chills).
Plural vs Singular
Use the plural 'escalofríos' when talking about being sick, but the singular 'un escalofrío' for a single moment of fear or a sudden breeze.
Don't say 'Estoy escalofrío'
Mistake: “Estoy escalofrío.”
Correction: Tengo escalofríos.
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