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Meaning of fill-in

fill-in

Pronunciation: (fil'in"), [key]
— n.
  1. a person or thing that fills in, as a substitute, replacement, or insertion: The company used a fill-in for workers on vacation.
  2. a brief, informative summary; a rundown.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.