verb · to lie over or cover part of something else; to superimpose or telescope

由于设计错误，这两张图纸的内容重叠了。

verb · unnecessary repetition or duplication of content, functions, or roles

这两个部门的职能有很多重叠之处。

verb · a grammatical process in which a word or part of a word is repeated

汉语中有许多动词可以重叠使用。