There are plenty of synonyms for the phrase "kill time," which means to pass time idly or procrastinate. Some alternative phrases include "waste time," "spend time aimlessly," "idle away the hours," "pass the time," or simply "wait around." Other options include "dawdle," "lounge," "lollygag," "loaf," and "procrastinate." Some more active options include "divert oneself," "amuse oneself," "entertain oneself," "engage in a pastime," or "partake in a hobby." Whatever way you choose to spend your time, it's important to make sure it's enjoyable and fulfilling, rather than simply killing time.