Once beaten, twice shy.

Once you have experienced some kind of injury or bad experience, people will have long-term fear and vigilance about related things or situations.

"Once bitten by a snake, twice shy" is a metaphor, which means that once you experience some kind of injury or bad experience, people will have long-term fear and vigilance about related things or situations. In this idiom, "once bitten by a snake" refers to an experience of being bitten by a snake, while "ten years of fear of straw rope" means that people will be afraid and alert to things similar to or related to snakes for ten years. This idiom means that a negative experience will have a far-reaching impact on people's psychology and make people feel scared and uneasy about similar situations. This idiom reminds people to be alert to the influence of past injuries and setbacks on themselves, and also reminds people to try their best to overcome their fears and psychological obstacles, and not to let past experiences bind their development and life.