Definition of borderline in English:

borderline

Syllabification: bord·er·line
Pronunciation: /ˈbôrdərˌlīn
 
/

noun

1A line marking a border.
More example sentences
  • The state secretary for maritime affairs stationed naval ships at the 12-mile borderline to ensure that the vessel didn't enter his country's waters.
  • But it's definitely somewhere near the New York-New Jersey borderline, where are the posh Victorian homes are.
  • Since then, hundreds of thousands have crossed the borderline through holes they made into the 6-meter height concrete wall.
1.1A division between two distinct (often extreme) conditions: 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.
Synonyms
dividing line, divide, division, demarcation line, line, cutoff point;
threshold, margin, border, boundary

adjective

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Barely acceptable in quality or as belonging to a category; on the borderline: 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.
Synonyms
marginal, uncertain, indefinite, unsettled, undecided, doubtful, indeterminate, unclassifiable, equivocal;
questionable, debatable, controversial, contentious, problematic, ambiguous
informal iffy

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