fill-in

1 of 2

noun

Synonyms of fill-innext
: someone or something that fills in
She performed well as the emergency fill-in.

fill in

2 of 2

verb

filled in; filling in; fills in

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.

Examples of fill-in in a Sentence

Noun I'm just a fill-in, so I have no idea where office supplies are kept 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Noun
Spurs stay small but survive Luke Kornet functioned well as Wembanyama’s fill-in, producing 14 points, 10 rebounds and two blocks in 30 minutes. Jeff McDonald, San Antonio Express-News, 25 Apr. 2026 Last word Gabby Lucivero, first woman to be named Connecticut Sportscaster of the Year, is leaving NBC CT after eight years to join ESPN radio as a fill-in host. Dom Amore, Hartford Courant, 19 Apr. 2026
Verb
The whole neighborhood is compact and walkable, with patios, cafés, and seasonal events like Yorkville Murals filling in the gaps. Condé Nast, Condé Nast Traveler, 23 Apr. 2026 But the water features had to be filled in when oil from the neighboring La Brea Tar Pits seeped up. David Allen, Daily News, 23 Apr. 2026 See All Example Sentences for fill-in

Word History

First Known Use

Noun

1917, in the meaning defined above

Verb

1840, in the meaning defined at transitive sense 1

Time Traveler
The first known use of fill-in was in 1840

Browse Nearby Words

Cite this Entry

“Fill-in.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.grautoblog.com/dictionary/fill-in. Accessed 26 Apr. 2026.

Kids Definition

fill in

verb
1
: to furnish with specified information
fill in an application
filled us in on the latest news
2
: to fill a vacancy usually temporarily : substitute
filled in during the emergency
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