There are 2 main definitions of fill in in English:

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fill in 1

Act as a substitute for someone when they are unable to do their job: my producer will have to have someone standing by to fill in for me
More example sentences
  • With Brooks absent because of a knock, the little-used Frost filled in at left-back.
  • In the absence of first-hand testimony, conjecture fills in.
  • Marky Ramone fills in on drums and former Black Flag member Dez Cadena slings guitar.
Synonyms
substitute, deputize, stand in, cover, take over, act as stand-in, take the place of
informal sub, step into someone's shoes/boots, pinch-hit
See parent entry: fill
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There are 2 main definitions of fill in in English:

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fill-in 2

Pronunciation: /ˈfilin/

noun

A person or thing acting or serving in place of another; a substitute: she could be a competent short-term fill-in [as modifier]: a college student working as a fill-in doorman
More example sentences
  • CIS hockey or football would be a perfect TV fill-in during the lockout.
  • Bob Costas, our fill-in host, will host all next week.
  • What Margolis has said here is meaningless, a mere fill-in.

For editors and proofreaders

Syllabification: fill-in

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