Thursday, September 7, 2017

meaning - What does やついておる mean?



I am unsure what やついておる means in the following sentence:



…貴様、何をにやついておるのだ…?



For some context Person A is comforting Person B who has just heard some happy news and gotten emotional. Person C says the above sentence.


I've not come across やついておる in my studies before, can someone explain this to me?




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