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borderline (n.)

also border-line, 1847, "strip of land along a frontier," from border (n.) + line (n.). As an adjective meaning "verging on" it is attested from 1903, originally in medical jargon.

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Definitions of borderline
1
borderline (n.)
a line that indicates a boundary;
Synonyms: boundary line / border / delimitation / mete
2
borderline (adj.)
of questionable or minimal quality;
borderline grades
Synonyms: marginal
From wordnet.princeton.edu