Meaning
To make a mark next to items on a list to show they have been completed.
Example Sentence
"As we finish packing each item, check it off the master list."
Synonyms
tick off
mark off
cross off
Usage Note
This phrasal verb is separable. When using a noun object, it can go between the verb and particle or after the particle. When using a pronoun object, it must go between the verb and particle (e.g., "turn it off" not "turn off it").