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

Examples
Necesito desactivar la alarma del despertador.
I need to turn off the alarm clock.
Puedes desactivar las notificaciones en los ajustes del teléfono.
You can disable notifications in the phone settings.
El técnico tuvo que desactivar el sistema de seguridad para entrar.
The technician had to deactivate the security system to enter.
Using 'lo' with deactivation
When talking about a setting you already mentioned, use 'lo' before the verb: 'Si no te gusta, lo desactivas' (If you don't like it, you deactivate it).
The power of 'des-'
In Spanish, adding 'des-' to the beginning of a word usually means 'to undo' the action, just like 'un-' or 'de-' in English.
Desactivar vs. Apagar
Mistake: “Voy a desactivar la luz.”
Correction: Voy a apagar la luz. Use 'apagar' for lights and general electronics; use 'desactivar' for features, alarms, or security settings.
Related Translations
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