Noun
That which cores; an instrument for coring fruit; as, an apple corer.
Source: Webster's dictionaryAny fool could be a witch with a runic knife, but it took skill to be one with an apple corer. Terry Pratchett
Hold on to me," Alec said, and Magnus gave him the sort of smile that made Alec feel like someone had taken an apple corer to his heart and tried to dig out the center. "I always do, Alexander,” he said. "I always do. Cassandra Clare
Cut off the tops of the squash and core them carefully: Gently insert a corer and remove the first inch and a half of the core by rotating the corer clockwise with your right hand and the squash counterclockwise with your left. Source: Internet
I've been making do with my apple corer, but now I want one. Source: Internet