Definition
When a distressing memory or emotion persistently troubles a person, it gradually increases their unhappiness.
（坏的回忆或感觉）不断困扰；持续折磨
Over time, that unpleasant experience has been eating away at her, leaving her unable to sleep well.
随着时间的推移，那次不愉快的经历一直困扰着她，使她无法好好入睡。
The doubts in his mind have been eating away at his confidence, causing him to perform poorly at work.
他心中的疑虑一直侵蚀着他的信心，导致他在工作中表现不佳。
The fear of failure has been eating away at his happiness, leaving him anxious about the future.
对失败的恐惧一直侵蚀着他的快乐，让他对未来感到焦虑。