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Meaning of red-letter

red-let•ter

Pronunciation: (red'let'ur), [key]
— adj.
  1. marked by red letters, as festival days in the church calendar.
  2. memorable; especially important or happy: a red-letter day in his life.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
redlegged grasshopper red light