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1. To draw a line through someone's name on a list (possibly to denote their presence, absence, or their completion of something). A noun or pronoun can be used between "cross" and "off." I crossed off all the kids that were on-time today. Hey, cross me off—I already brought in my donation.
2. To mark something as completed, as on a list. A noun or pronoun can be used between "cross" and "off." I mowed the lawn today, so I can finally cross that off my to-do list. You'll finally be able to cross off hang gliding on your bucket list!
cross someone or something off (of) somethingand cross someone or something off
to eliminate a name from a list or record. (Of is usually retained before pronouns.) We will have to cross her off of our list. We crossed off Sarah. I crossed the sweater off the list of what I needed to buy.