Wiktionary
vb. 1 To make gaudy and bright. 2 To give a rhythm/melody reminiscent of jazz.
WordNet
Usage examples of "jazz up".
Most people take tubes of mustard or curry paste with them to jazz up the rations, and spicy smells emanated from areas where people were doing supplementary fry-ups.
He can't stand that magazine because they jazz up the facts of a case too much.
As far as sales went, the day was pretty slow going-the usual looky-loos, a couple of rich teenage boys looking for ways to jazz up their cheap transportation.
Besides, if this guy's using a pay terminal-which he must be, to judge from the image quality-it can't jazz up his avatar.
Besides, if this guy's using a pay terminal -- which he must be, to judge from the image quality -- it can't jazz up his avatar.
She gazed at it, willing it to drop on to the stiff white bit of fancy headgear that the nuns wore to jazz up the black.