The phrase "sharpened to" is correct and usable in written English.
You can use it when something has been sharpened to a specific point or level. For example, "He sharpened the knife to a fine point."
Finch opened a drawer and removed a wooden chopstick she had sharpened to a point with an automatic pencil sharpener from the staff room.
You were sharpened to a fine point.
(He wore his incisor teeth sharpened to the hearing).
It is a skill that will be sharpened to a blade..
Cathedral leaned into him, picking chicken out of his teeth with an inch-long fingernail sharpened to a point.
But then there is Meg, heavily pregnant, her mind sharpened to a scalpel point by disappointment and loneliness.
Roth has always been a devastating mimic; these voices are immediately recognizable yet sharpened to draw blood, a gathering requiem in the vernacular.
Throughout "Arirang," dancers point a finger and swirl it around; it's the aimless hand jive of contemporary dance sharpened to its narrowest tip.
"The tip is sharp and the blade, maybe it's not sharpened to Ginsu or chef standards, but it's sharp enough to cut," Buhman said.
Hummus is sharpened to a lively tang with copious lemon juice, while melitzanes salata, an eggplant spread, is chunky and deliciously smoky.
An antler sharpened to a spike, a bony bread knife from a time of glassy uplands and no bread: Greetings from Doggerland, it said.
