mark somebody/something ↔ off phrasal verb ( see also ↑ mark )
1 . to make an area separate by drawing a line around it, putting a rope around it etc:
The competitors’ arena had been marked off with cones.
2 . to make a mark on a list to show that something has been done or completed SYN tick off , check off :
Mark off each of the names on the list as I call them out.
3 . British English to make something or someone different from other things or people of a similar type SYN distinguish
mark somebody/something ↔ off from
Sara’s natural flair for languages marked her off from the other students.