noun
a gradual decrease in loudness or intensity, especially in music
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The orchestra executed a perfect decrescendo at the end of the symphony.
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As the song came to an end, the music slowly got quieter in a decrescendo.
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The party was so loud, but then there was a decrescendo when the police showed up.
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The tension in the room seemed to decrescendo as everyone took a deep breath and calmed down.