sour·​dine | \ ˈsu̇(ə)rˌdēn\
plural -s

Definition of sourdine

1 : any of several obsolete musical instruments distinguished by their low or soft tone: such as
a : a trumpet used in giving soldiers the signal to march
b : spinet

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History and Etymology for sourdine

French, from Italian sordina, sordino, from sordo silent, dull-sounding, deaf (from Latin surdus) + -ina, -ino (diminutive suffixes)

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