Definition of borderline adjective from the Oxford Advanced American Dictionary

 

borderline

 adjective
adjective
NAmE//ˈbɔrdərˌlaɪn//
 
 
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not clearly belonging to a particular condition or group; not clearly acceptable In borderline cases, teachers will make the final decision, based on the student's previous work. a borderline pass/fail on an exam
See the Oxford Advanced Learner's Dictionary entry: borderline

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