There are several synonyms that can be used instead of the phrase "fritter away time". These include "waste time", "squander time", "idle away time", "fiddle around", "procrastinate", "dilly-dally", "loiter", "dawdle", "lollygag", "slack off", "delay", "put off", "postpone", "defer", "evade", "avoid" and "sidetrack". All of these phrases imply a sense of wasting valuable time or not using it wisely. It's important to be mindful of how we use our time and make sure to prioritize our tasks so that we can be productive and achieve our goals.