There are 2 definitions of fill in in English:

fill in1

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

Definition of fill in in:

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Word of the day fioritura
Pronunciation: fēˌôriˈto͝orə
noun
an embellishment of a melody...

There are 2 definitions of fill in in English:

fill-in2

Syllabification: 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
  • What Margolis has said here is meaningless, a mere fill-in.
  • Seven years later, Cardinal Law reassigned Forry to a job as a roaming, fill-in priest to cover for priests on holiday.
  • The C-store market opens up new opportunities for grab-and-go dairy items, while continuing to serve as a fill-in grocery.

Definition of fill in in: