to mark or cross out the name of a person or thing on a list. I am glad to see that you were able to come. I will check you off. I checked the items off.I checked off the recent arrivals.
To put a check mark on or next to some item on a list to indicate that it has been reviewed or completed: Don't forget to check off the task after you have completed it. As I put the groceries in the cart, I checked them off on my list.