How to Say "to decrease" in Spanish
The Spanish word for “to decrease” is “bajar” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
verbA2
formal or numerical reduction

Examples
Por favor, baja el volumen de la música, está muy alto.
Please, lower the volume of the music, it's too high.
Dicen que van a bajar los impuestos este año.
They say they are going to lower taxes this year.
Confusing 'bajar' and 'reducir'
Mistake: “Using 'reducir' for volume/light: 'Voy a reducir la luz.'”
Correction: Use 'bajar' for levels and intensities, as in 'Voy a bajar la luz/el volumen.' 'Reducir' is better for size or complexity.
Related Translations
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