Jisho

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Wikipedia definition
1. DequeísmoDequeísmo is a variation in Spanish grammar, considered wrong in prescriptive works, which consists in using de que instead of just que as the complementizer introducing a verbal complement clause. For example: Me dijo de que estaba cansado ("He told me that he was tired") is a case of dequeísmo since the usual construct is Me dijo que estaba cansado. Dequeísmo is considered peculiar to less-educated speakers, most probably as an instance of hypercorrection.
Read “Dequeísmo” on English Wikipedia
Read “デケイスモ” on Japanese Wikipedia
Read “Dequeísmo” on DBpedia

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