Sourdine, a French word meaning mute or dampener, refers to a device used to reduce the sound of a musical instrument. There are several synonyms for this word that are commonly used in the context of music. One such synonym is mute, which is widely used in the case of brass and woodwind instruments. Another synonym is damper or dampener, which is often used in the context of keyboard instruments such as the piano. Other synonyms for sourdine include silencer, suppressor, and muffle. All of these words essentially mean the same thing, which is to reduce the volume of a musical instrument, typically for practice or recording purposes.