When you want to express that you're taking precautions to avoid risk, you can use a variety of synonyms for "is safe side". Some of the options include "is on the side of caution", "is being careful", "is playing it safe", "is taking no chances", and "is hedging one's bets". All of these phrases communicate a sense of prudence and considerate decision-making to avoid danger or negative outcomes. Whether you're checking and double-checking your work, taking extra time to consider a decision, or consulting others for their input, being on the safe side is always a wise choice.