To join two pieces of wood by cutting a line across both pieces and then fitting them together.
This is a word that carpenters use. It's about making things out of wood.
Examples:
He will scarph the wood to make a strong table.
The carpenter scarphed the pieces together.
Scarphing the wood makes it stronger.
I scarphed the wood and it broke!
He scarphed the wood so well, it never broke.
The carpenter scarphed the wood and made a very strong table.