I am my own Urban Dictionary V

Term: class up

Definition 1: To make classy

Definition 2: To take on the attributes of a social or monetary status higher than your own, at times by way of unnecessary embellishments.

Examples of usage:
1. I like how you classed up your office with those Andy Warhol posters.
2. Mitch tried to class-up his 2001 Sebring by adding nice rims, but alas, he should have just bought a cooler car.