mark off
mark out

His little black bag and serious air marked him out as a doctor.

And that marks him out as a special kind of young potential leader.

It is the close attention to the needs of individual students that marks the school out.

I know the life this country has marked out for me.

I can mark them out in any of five different colors, one at a time, or all together.

But the information she already had marked her out as a target.

At age 17 did you have a different direction sort of marked out for yourself?

That seemed to mark it out from the rest as an important place.

Yet she was marked out as his and no one else's.

His whole life seemed to have been marked out by the books and the documents he had read.