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1. To slowly become more forceful or powerful. Make sure the guitars fade up during the first verse.
2. To slowly cause something to become more forceful or powerful. The sound engineer faded the guitars up during the first verse.
fade something up
to increase the sound gradually. (Broadcasting.) The director faded the music up and then down again before the announcer spoke. Fade up the music when the announcer stops talking.
1. To increase in intensity: The sound of the drums fades up as the piece begins.
2. To cause something to increase in intensity: The director said we should fade the lights up on the back of the stage. The picture faded up as the movie began.