borderline

US /ˈbɔːr.dɚ.laɪn/
UK /ˈbɔːr.dɚ.laɪn/
1.

ranh giới

between two different conditions, with the possibility of belonging to either one of them:

:
Only in borderline cases will students be allowed to retake the test.
1.

ranh giới

something that separates two different qualities:

:
The borderline between friendship and intimacy is often hard to define.