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Meaning of black-bag

black-bag

Pronunciation: (blak'bag'), [key]
— adj. Informal.
  1. of, pertaining to, or distributing money for expenses that has been diverted from the regular budget: Black-bag funds have paid for much overseas travel by the military.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.