"Be on the safe side" is a commonly used phrase to indicate that one should take precautions to avoid potential risks or harm. However, this phrase can become repetitive and lose effectiveness in communication. Some synonyms for "be on the safe side" include "err on the side of caution," "play it safe," "take no chances," "be cautious," "take precautions," "act carefully," and "be vigilant." These synonyms can help convey the same message but with a different tone or emphasis. By having a variety of synonyms to choose from, speakers and writers can better express their intended meaning and avoid repetition in their language.