"borderline for" is a correct and usable phrase in written English.
It typically refers to something that is just barely sufficient for a certain criterion or requirement. For example, "The score on the exam was borderline for passing the class."
So I'm on the borderline for that".
(The borderline for high blood pressure is 140 over 95).
For politicians and financiers, marginal means land that is borderline for modern agriculture.
He put his uniform back on and headed to the Borderline for what wound up being a sleepless night.
Political Animal (@politic_animal) At the moment, Glenys Stacey isn't troubling the C/D borderline for her performance at the select committee.
Vincent Velella has an average I.Q., but he has dementia and his short-term memory is on the borderline for mild mental retardation, a psychologist testified yesterday.
The English pair, both former British champions, are seeded 18 (Howell) and 27 (Jones), so on paper are right on the borderline for World Cup qualification.
More than 300,000 people are believed to live south of the Litani - which has twice been the borderline for Israeli buffer zones.
Assessments of the psychomotor development of the other 88 was normal for 52%; borderline for 20%, moderately handicapped for 20%, and severely handicapped for 8%.
Intellectual disability is commonly identified through standardized intelligence tests, a tested intelligence quotient (IQ) of 70 being the usual upper borderline for those needing special care and training.
This is below the borderline for EPA acceptability, but the team of researchers studying Flint's water say that levels this high can be a cause for concern, particularly for young children.
