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English definition of “borderline”

borderline

adjective uk   /ˈbɔː.də.laɪn/ us    /ˈbɔːr.dɚ-/
between two different conditions, with the possibility of belonging to either one of them: Only in borderline cases (= cases where students might succeed or fail) will pupils have an oral exam. She was a borderline candidate.Different and difference

borderline

noun [S] uk   /ˈbɔː.də.laɪn/ us    /ˈbɔːr.dɚ-/
something that separates two different qualities: The borderline between friendship and intimacy is often hard to define.Separating and dividing
(Definition of borderline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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