better safe than sorry is a old saying.
it indicates that we'd better be careful and make good preparation before the serious situation comes.
supplemental instruction(补充说明):
better safe than sorry在中文中对应的说法有
小心无大错
稳妥总比出错好
安全胜过遗憾
我是英语专业的,以前遇到过很多类似的习语翻译,希望对你有帮助.