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mark (something) out
To draw, establish, or otherwise indicate the boundary of some region or area. We went through with the architect and marked out exactly where our property ended and the neighbors' property began. Please mark out the area you intend to excavate.
To establish explicitly the outline, boundary, or shape of some region or thing, by or as if by drawing lines or points around it: We marked out the territory we wanted to explore on the map. Let's mark out the boundaries of the new garden.