Being cautious and prepared is always a wise approach, especially when dealing with uncertain or risky situations. There are several alternative phrases that can be used to convey the same meaning as "is on safe side." Some of these synonyms include "playing it safe," "err on the side of caution," "being prudent," "taking precautions," "exercising due diligence," "being careful," "ensuring security," "being mindful," and "taking preventative measures." All of these expressions refer to the act of being attentive, thoughtful, and careful in our actions to minimize potential negative outcomes and avoid unnecessary risk. By using these synonyms, we can more effectively communicate the importance of taking proactive and responsible steps to protect ourselves and those around us.