Of one’s own accord：by one’s own choice, without external compulsion, intervention or coercion ; voluntarily. （自愿/自发 自然而然地）
Woman：The Quality Control records show that since the night shift was introduced, it’s had a very high percentage of defective items that have to be rejected. We need to reduce the figure.
Man：I think it’s because some people who used to work only on day shifts don’t like working at night.
Woman：Yes, several supervisors have noticed the resentment. I think it’ll die down of its own accord.