Definition of borderline in English:

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Pronunciation: /ˈbɔːdəlʌɪn/


1A boundary separating two countries or areas.
Example sentences
  • By drawing borderlines separating the yellow/red areas and surrounding blue areas, we obtained three major categories of genes.
  • He entertained in fact far-reaching plans to build an advanced high-tech fence along the future borderline in order to separate effectively the two populations from each other.
  • But surely you understand that it is impossible to control the entire borderline at all times.
1.1A division between two distinct or opposite things: the borderline between ritual and custom
More example sentences
  • I like that: revel in your glorious failures, dance on the borderline between success and disaster, because that is where your next breakthrough will come from.
  • Bar owners complain of unfair business when they are located on the borderline between smoking and non-smoking.
  • It was an enjoyable and memorable night on the borderline of Galway and Mayo.
dividing line, divide, division, demarcation line, line of demarcation, line, cut-off point;
threshold, margin, fringe, limit, border, boundary, periphery


Only just acceptable in quality or as belonging to a category: references may be requested in borderline cases
More example sentences
  • Another explanation of the findings could be that borderline dementia subjects might have lower leisure activity as a result of early disease.
  • I have been told that I am borderline dangerously overweight.
  • During long stretches of borderline freezing temperatures when the frost line neither advances nor recedes, water is continually drawn up to the ice lens where it freezes.
marginal, indefinite, uncertain, unsure, unsettled, undecided, up in the air, doubtful, open to doubt, problematic, indeterminate, unclassifiable, ambivalent, equivocal;
questionable, open to question, disputable, debatable, arguable, controversial, contentious, moot
informal iffy
British informal dodgy

For editors and proofreaders

Line breaks: bor¦der|line

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