v.1. To make X-shaped marks on something to indicate that it should be deleted, canceled, or ignored: The editor will x out any offensive lines in your letter before publishing it. I wrote my number on the sheet and then, thinking again, I x'ed it out.
2. To remove someone or something from a list or record: Many details of the Spanish civil war have been x'ed out of the history books to make room for more recent events. My name should be on the admissions list unless they have decided to x me out.