Definitions
1.nounA boundary or accepted division; a border."She lives on the borderline between reality and madness."
2.nounAn individual who has borderline personality disorder.
3.verbTo border, or border on; to be physically close or conceptually akin to.
4.adjectiveNearly; not clearly on one side or the other of a border or boundary, ambiguous."I would rather hire a talented layman than a university graduate with borderline qualifications."
5.adjectiveShowing bad taste."Your borderline remarks about my aunt's dress destroyed my evening."
6.adjectiveExhibiting borderline personality disorder.
7.adverbNearly; not entirely but nevertheless to a great extent"He is borderline hypoglycemic and needs to monitor his sugar intake."