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, provide cover, take over, act, act as deputy, act as stand-in, sit in, act as understudy, understudy, be a proxy, act as locum tenens;
take the place of
North American informalpinch-hit
See parent entry: fill

Definition of fill in in:

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There are 2 main definitions of fill in in English:

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fill-in 2 Line breaks: fill-in

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.

Definition of fill in in:

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