borderlines

/B AO1 R D ER0 L AY0 N Z/
noun
  1. 1

    A boundary or accepted division; a border.

    โ€œShe lives on the borderline between reality and madness.โ€

  2. 2

    An individual who has borderline personality disorder.

Source: https://en.wiktionary.org/wiki/borderline, https://en.wiktionary.org/wiki/borderlines