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measure (something) off
1. To measure the dimensions of something. Measure off three-foot sections on those two-by-fours, and I'll cut them on the table saw. Could you measure this off for me?
2. To determine the perimeter of some region. Let's measure off the section that needs to be repainted. Police measured the area off to keep onlookers from contaminating the crime scene.
measure something off
to determine the length of something. He measured the length of the room off and wrote down the figure in his notebook. Fred measured off the width of the house. Fred measured a few feet of string off, and cut it with a knife.
To isolate, define, or identify some region within another by measurement: The surveyors measured off the part of the property where the house was going to be built. The builders measured each section off precisely before pouring the concrete.