To make something sharp or sharper.
Sharpening something can make it more useful or dangerous, like a knife or a pencil.
Examples:
I sharped my pencil before the test.
She sharped the knife to cut the bread.
He always sharps his tools before using them.
I sharped my crayon and accidentally broke it.
She sharped the sword until it was the sharpest in the land.
He sharped the scissors and then cut the paper.