How to Say "decreased" in Spanish
The Spanish word for “decreased” is “bajó” — B1 level. This is a very common word in everyday Spanish.

Examples
El gobierno bajó los impuestos el mes pasado.
The government lowered taxes last month.
Él bajó la voz para que nadie lo oyera.
He lowered his voice so nobody would hear him.
La tienda bajó el precio de las televisiones.
The store decreased the price of the televisions.
Transitive Use
In this sense, 'bajó' is transitive, meaning it needs an object. You are lowering something (the taxes, the voice, the volume).
Confusing 'Bajar' and 'Reducir'
Mistake: “Using 'Reducir' when talking about volume or turning things off/down (e.g., 'Redujo la luz').”
Correction: Use 'bajar' for volume, light, or intensity changes: 'Bajó la luz' (He/She turned down the light).
Related Translations
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