noun
a gradual increase in loudness or intensity, especially in music
verb
to reach a point of intensity or force
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The orchestra reached a powerful crescendo during the final movement of the symphony.
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The music slowly built up to a crescendo before the big finale.
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The party was really boring at first, but it hit a crescendo once the DJ started playing.
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Tensions between the two countries have been escalating, reaching a crescendo in recent weeks.