From Longman Dictionary of Contemporary Englishmark somebody/something ↔ off phrasal verb1SEPARATEto make an area separate by drawing a line around it, putting a rope around it etcThe competitors’ arena had been marked off with cones.2FINISH DOING somethingto make a mark on a list to show that something has been done or completed syn tick off, check offMark off each of the names on the list as I call them out.3DIFFERENT British English to make something or someone different from other things or people of a similar type syn distinguish fromSara’s natural flair for languages marked her off from the other students. →mark→ See Verb table
Examples from the Corpus
mark off• Dollar: 104. 93 yen, up 0. 40; 1. 4360 marks, off 0. 0030.• Dollar: 105. 25 yen, up 0. 38; 1. 4425 marks, off 0. 0035.• Dollar: 105. 32 yen, up 0. 07; 1. 4390 marks, off 0. 0035.• Firstly, you will need to make a cardtemplate for your scallops in order to mark them off accurately.• He advocatesmarking the stretchers off one at a time instead of squaringcross all four at once.• D., said that it was on the GrandRiver on a marked road offU. S. Highway 12.• White lines marking the area off were paintedThursday.• It marked us off, you might say - from the literarycrowd, I mean.