the act of pronouncing a word or sound wrongly, or an example of this

Mispronunciation can be a serious obstacle to making yourself understood in a foreign language. 错误的发音可能会严重阻碍你用外语表达自己的意思。

I made a slight mispronunciation and the girl behind the counter didn't understand me. 我的发音有点小错误，柜台后面的女孩没听懂我的话。