noun
the line that separates one country, state, province, etc., from another; the border
adjective
of, relating to, or characteristic of a border
adverb
on or near a border
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The patient's symptoms are borderline between two different medical conditions.
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I think his behavior is borderline crazy sometimes.
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She's always on the borderline of getting in trouble.
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The line between success and failure is often borderline thin.