fill-in

The definition of a fill-in is a person or thing that is a substitute for someone or something else.

(noun)

An example of fill-in is a substitute teacher.

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See fill-in in Webster's New World College Dictionary

noun

a person or thing that fills a vacancy or gap, often temporarily

See fill-in in American Heritage Dictionary 4

noun
Informal
  1. One that serves as a substitute for another.
  2. A short informative summary.

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