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Meaning of gravy train

gra'vy train"

Pronunciation: [key]
— Slang. Slang.
  1. a position in which a person or group receives excessive and unjustified money or advantages with little or no effort: The top executives were on the gravy train with their huge bonuses.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.