\ˈfil-ˌin \

Definition of fill-in 

(Entry 1 of 2)

: someone or something that fills in

fill 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


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

Mom's at the wheel, grandma's in the passenger seat, and four children, including a boy who uses a wheelchair, fill in the two rows in the back. Dan Simmons,, "2 years after Philando Castile's death, programs aim to transform relations between police, residents," 8 July 2018 And unlike last year's ceremonies, where a couple clear frontrunners had already emerged by this point in Kendrick Lamar and Ed Sheeran, the big categories seem fairly open in 2018 -- especially since there's now eight slots to fill in each. Andrew Unterberger, Billboard, "Eight Artists Who Could Benefit From the 2019 Grammys' New Expanded Major Categories," 27 June 2018 Jurickson Profar, who filled in for Andrus at shorstsop, was in Monday's startling lineup at second base in place of Rougned Odor. Stefan Stevenson, star-telegram, "Rangers Elvis Andrus returns, Jurickson Profar starts in place of Rougned Odor," 18 June 2018 Is there any connecting Batman to—fill in the blank? Stephen Metcalf, The New Yorker, "How Superheroes Made Movie Stars Expendable," 19 May 2018 Though numerical models and computer simulations are valuable, the physical model generates a steady stream of data that fills in digital gaps. Ernie Mastroianni, Discover Magazine, "A Mighty Model," 15 May 2018 Lawmakers have recently proposed creating a National Volcano Early Warning and Monitoring System to fill in these gaps. Umair Irfan, Vox, "Volcanoes are awe-inspiring. Here are 7 things to know about them.," 11 May 2018 Hopefully, these are just the legions of the miserable who have nothing better to do than hang out on social media and complain about how they have been wronged by (fill in the blank). Mike Bianchi,, "UCF fans, don't forget Scott Frost is the reason you can claim a national championship," 10 May 2018 Sturaro featured just 12 times for Juventus in the 2017/18 Serie A season, failing to hold down a permanent position in the side and often filling in at right back when called upon., "Leicester Plotting £20m Raid for Juventus Midfielder as Foxes Look to Reinvest Riyad Mahrez Cash," 11 July 2018

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

The first known use of fill-in was in 1840

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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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Comments on fill-in

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playful or foolish behavior

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