idiom · concerns about potential negative repercussions or future complications resulting from a decision or action

如果不彻底解决这个漏洞，恐怕会留下后顾之忧。

idiom · anxieties about one's family or home situation that prevent one from acting or focusing on the task at hand

公司为员工解决了子女入学问题，让他们在工作时没有后顾之忧。