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To make something fancier, more festive, more exciting, etc., often through some form of adornment. I've decided to jazz up my wardrobe with some statement shoes and other funky accessories. You need to add some excitement your story—jazz it up a bit.
1. mod. alert; having a positive state of mind. Those guys were jazzed and ready for the game.
2. mod. alcohol or drug intoxicated. Dave was a bit jazzed up, but not terribly.
3. mod. enhanced; with something added; having been made more enticing. It was jazzed enough to have the police chief around asking questions.
4. mod. forged or altered. (see also tinseled.) Better not try to cash a jazzed up check at this bank.