noun
a physical or visual indication of a boundary or limit
verb
to indicate or designate a boundary or limit
adverb
used to modify or describe how the action of marking off is done
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The surveyor used a measuring tape to mark off the boundaries of the property.
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I'll use some tape to mark off where we can park our cars.
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Let's use some chalk to mark off our spot at the concert.
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She decided to mark off certain tasks on her to-do list before starting a new project.