\ 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 Big Bang Theory alum and neuroscientist Mayim Bialik will fill in as the show's interim host. Dory Jackson,, 27 Aug. 2021 In the meantime, one of the other safeties such as Javonte Moffatt, Sheldrick Redwine or Richard LeCounte III will fill in for Delpit. cleveland, 27 Aug. 2021 Steve Jordan will fill in for Watts, as announced earlier in August in light of a medical procedure Watts had to undergo. Bethy Squires, Vulture, 25 Aug. 2021 Separate recordings of on-the-ground radio communication on June 24 fill in the details from the log entries. al, 22 Aug. 2021 The team also released quarterback Jake Dolegala. Khoury, a 2017 graduate of Carnegie Mellon, will fill in for longtime snapper Joe Cardona, who will miss an undefined period of time after exiting Sunday’s practice with an injury., 9 Aug. 2021 Meg Coyne, the national team’s manager and assistant coach, will fill in during Larson’s absence. Julie Jag, The Salt Lake Tribune, 28 July 2021 Engineers at Carnegie Mellon University paired a depth sensor with a standard color camera to fill in data gaps by catching hues of red, green and blue around the edges of see-through objects. Angus Loten, WSJ, 8 July 2021 Despite being some of the largest species in our oceans, scientists are still trying to fill in the gaps of our knowledge on these large, filter-feeding rays! Melissa Cristina Márquez, Forbes, 6 July 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

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Cite this Entry

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

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More Definitions for fill-in



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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