We also call this a slip of the tongue.

我们也称之为口误（a slip of the tongue）。

If it was moving relative to the ground … that would be what we call slipping.

如果它相对于地面移动， 我们称之为滑倒。

" I don't think much of you, young man, " said Aronsen; ay, calling him young man, considering him but a slip of a lad that had grown conceited in the town, and thought to teach him, Aronsen, the value of goods.

“我看不起你，年轻人，”阿伦森说。是的，称他为年轻人，认为他不过是一个在城里变得自负的小伙子，想要教他，阿伦森，货物的价值。