line of demarcation

“When Bush was playing football at USC, all Defendants precluded Bush from receiving any financial benefits claiming that certain rules were in place and necessary to promote the NCAA’s principle of ‘amateurism’ and to preserve ‘a clear line of demarcation between intercollegiate athletics and professional sports,’” the lawsuit states.

It felt like a really good line of demarcation for me of one phase of my career to another.

The 100-pitch mark has grown into the almost-universal line of demarcation to when a pitcher should come out.

There was no line of demarcation between Richard onstage and off.

Testimony for years, he said, demonstrated a “symbiotic relationship between the C.I.A. and F.B.I., with no clear line of demarcation.”