Primarily used when making corrections on physical documents or in notebooks. She scored through her old address and wrote the new one above it.
Pro Tip 2/3
Visual Emphasis
Drawing a line indicates that the text is visibly and clearly incorrect or not applicable. After checking the answers, he scored through all the wrong ones.
Pro Tip 3/3
Error Correction
Use 'score through' to show you recognize a mistake and intend to disregard or correct it. I scored through the typo in my essay.