What is err on the side of caution?

"Err on the side of caution" is a commonly used idiom that means to be cautious or careful when making a decision, even if it means being overly cautious. It's a way of saying that it's better to take a little extra caution than to take a risk that could result in negative consequences. The phrase is often used in situations where there is a potential for harm, danger, or loss, and is sometimes used to advise people to prioritize safety over convenience or speed. In general, erring on the side of caution is seen as a sensible approach to decision-making, particularly in situations where the stakes are high.