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Meaning of green line

green' line"

Pronunciation: [key]
— (sometimes caps.)
  1. (in Lebanon) a demarcation line that divides predominantly Christian East Beirut and predominantly Moslem West Beirut.
  2. any similar demarcation line between two hostile communities, as between Greek and Turkish Cypriots in Nicosia.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.