How to Say "switches off" in Spanish
The Spanish word for “switches off” is “apaga” — A1 level. This is a very common word in everyday Spanish.

Examples
Ella siempre apaga la televisión antes de estudiar.
She always turns off the television before studying.
El sistema se apaga automáticamente si hay un error.
The system shuts down automatically if there is an error.
Usted apaga la luz al salir de la oficina, ¿verdad?
You (formal) turn off the light when leaving the office, right?
The 'G' to 'GU' Change
When conjugating 'apagar' in certain forms (like the preterite 'yo' form: 'apagué'), the 'g' changes to 'gu'. This change is only there to make sure the 'g' keeps its hard sound, like in the English word 'gate'.
Confusing Subject Forms
Mistake: “Using 'apaga' when you mean 'I turn off' ('yo apaga').”
Correction: Remember 'apaga' is reserved for 'he/she/it' or formal 'you' (usted). For 'I', you must use 'apago'.
Related Translations
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