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1.
in a position of risk or vulnerability.
Jill was on the line once more.
by The Return of Light Joker July 10, 2008
 
2.
When a bro only texts a girl when he's lonely or needs attention. Usually he's inconsistent and keeps her on a rotation with other girls. Basically leading a girl on through text. No commitment.
"yeah, i'm not really looking for a relationship right now so I'm just keeping this girl on the line."
by TripleC October 27, 2014