border line: Meaning and Definition of

bor'der line"

1. boundary line; frontier.

bor•der•line

1. on or near a border or boundary.
2. uncertain; indeterminate; debatable: not an alcoholic, but a borderline case.
3. not quite meeting accepted, expected, or average standards.
4. approaching bad taste or obscenity: He made several borderline remarks that offended them.

1. a person suffering from borderline personality.