Here's a breakdown:
* Laugh: This signifies amusement, but in this case, it's not a pleasant kind. It's a harsh, derisive laughter.
* Scorn: This implies extreme disdain, disgust, and disrespect.
Example:
"The villagers laughed to scorn the stranger's claims of being a prince."
Other ways to express the same meaning:
* Hold in contempt
* Scoff at
* Ridicule
* Mock
Essentially, "laugh to scorn" is a way of saying that someone or something is so insignificant or ridiculous that they are not even worthy of serious consideration.