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English definition of “borderline”

borderline

noun [S]     /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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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