\ ˈfil-ˌin How to pronounce fill-in (audio) \

Definition of fill-in

 (Entry 1 of 2)

: someone or something that fills in

fill in

filled in; filling in; fills in

Definition of fill in (Entry 2 of 2)

transitive verb

1 : to enrich (something, such as a design) with detail
2 : to give necessary or recently acquired information to I'll fill you in

intransitive verb

: to fill a vacancy usually temporarily interns filled in for regular staffers

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Examples of fill-in in a Sentence

Verb my friend quickly filled me in on the portion of the movie that I had missed she's only filling in while the regular secretary is on vacation
Recent Examples on the Web: Verb The Blazers have yet to announce who will fill in as host for road games when Everett is not available. oregonlive, 12 Oct. 2021 Just gently tap the pan to let the mixture fill in the gaps between the potatoes. Amy Drew Thompson,, 29 Sep. 2021 Most of the new jobs will be full time, with a relatively small percentage having temporary status to fill in for vacations and absent workers. CBS News, 28 Sep. 2021 The game show went ahead with airing Richards' episodes after his exit, and announced that Mayim Bialik would fill in as interim host. Greta Bjornson,, 14 Sep. 2021 Last year, the school system was accepting volunteers to substitute in classrooms and even had central office staff fill in when needed. Kristen Griffith,, 5 Sep. 2021 Online tutoring companies have been boosted by a pandemic in which parents — and now also schools — are looking for ways to help children fill in the gaps left by an education system that is still grappling with its own remote-learning shortcomings. NBC News, 2 Sep. 2021 Automakers generally have a team of temporary workers fill in when regular workers are gone. Phoebe Wall Howard, Detroit Free Press, 27 Aug. 2021 Her data from families without children indicated that companion animals, like dogs and cats, can fill in for the child role in a family where there are no human children present., 19 Aug. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fill-in.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fill-in


1917, in the meaning defined above


1840, in the meaning defined at transitive sense 1

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Time Traveler for fill-in

Time Traveler

The first known use of fill-in was in 1840

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Dictionary Entries Near fill-in

fillet weld


fill in

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Cite this Entry

“Fill-in.” Dictionary, Merriam-Webster, Accessed 22 Oct. 2021.

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English Language Learners Definition of fill-in

: someone who takes the place of another person who is away for a short time : someone who fills in for someone else


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