1. (常指神话传说中)被(仙女)调换的婴儿
A changeling is a child who was put in the place of another child when they were both babies. In stories changelings were often taken or left by fairies.
e.g. I have always felt like a changeling born into the wrong family.
我一直感觉自己小时候被调包过，不是这一家的人。