Adding zest to something means to make it more exciting or interesting. The crossword solutions for this term are SEASON (6 letters), SPICE (5 letters), LIVEN (5 letters), ENLIVEN (7 letters), ANIMATE (7 letters), BRIO (4 letters), PUNCHUP (7 letters), and SPICEUP (7 letters). All of these words suggest that one can add zest to something by adding flavor, energy, or enthusiasm. Seasoning something with spices, livening it up, enlivening it, animating it, adding BRIO, punchup, or spiceup are all ways to make something more exciting or interesting.