The term 'ADD ZIP TO' can be completed with the crossword solutions SEASON (6 letters), SPICE (5 letters), ENLIVEN (7 letters), GINUP (5 letters), and PEPUP (5 letters). This phrase is often used to describe the act of adding something to make something more interesting or exciting. The solutions provided suggest that one way to add zip to something is to SEASON it, SPICE it up, ENLIVEN it, gin it up, or pep it up. Seasoning something can refer to adding herbs and spices to food to enhance its flavor. Spicing something up can mean adding a bit of excitement or drama to a situation. Enlivening something can involve adding energy or enthusiasm to it. Ginning something up can refer to creating something from nothing. Finally, peping something up can mean adding enthusiasm or vigor to it.