1. phrasal verb If you jazz something up, you make it look more interesting, colourful, or exciting. [informal] [V P n] ⇒ Mary Ann had made an effort at jazzing up the chilly modern interiors. [V n P] ⇒ I don't think they're just jazzing it up for the media. 2. phrasal verb → jazz If someone jazzes up a piece of music, they change it in order to make it sound more like popular music or jazz. [V n P] ⇒ Instead of playing it in the traditional style, she jazzed it up. [V P n] ⇒ Stephen and I are going to jazz up the love songs. [V-ed P] ⇒ The tune is basically the same as the old one, but considerably jazzed up.
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