fill-in
1 of 2noun
ˈfil-ˌin 
: someone or something that fills in
fill in
2 of 2verb
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
Synonyms
Noun
- backup
- cover
- designated hitter
- locum tenens
- pinch hitter
- relief
- replacement
- reserve
- stand-in
- sub
- substitute
Verb
- acquaint
- advise
- apprise
- brief
- catch up
- clear
- clue (in)
- enlighten
- familiarize
- hip
- inform
- instruct
- tell
- verse
- wise (up)
See all Synonyms & Antonyms 
Example Sentences
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
Andrew Tredinnick, USA TODAY, 4 Sep. 2022 But the Wildcats have options to fill in for as long as Rodriguez is gone. Brett Dawson, The Courier-Journal, 3 Sep. 2022 The hour-long appearance began at 7 p.m. CT and was hosted by Chris Stewart, who will also fill in for Eli Gold in the radio booth for Alabama’s opener Saturday night. Mike Rodak | Mrodak@al.com, al, 1 Sep. 2022 Mekari is the rare super-utility lineman who can fill in ably at all five positions. Childs Walker, Baltimore Sun, 31 Aug. 2022 But the Wildcats have a hole to fill in the secondary. Andrew Seligman, Chicago Tribune, 20 Aug. 2022 No defender was within four feet of Green on 212 of his 271 long-range attempts last season, which is the role that Prince would fill in Philly. Bryan Toporek, Forbes, 25 June 2022 Although bioengineers have created machines that can temporarily take over the work of the heart, the lungs and even the kidneys, there is no device or procedure that can fill in for the liver. Brenda Goodman, CNN, 13 May 2022 School district leaders have tapped central-service staff to fill in classes during the month of September. Nicole Asbury, Washington Post, 29 Aug. 2022 See More
Verb
But if Scherzer misses time, Peterson would be the clear option to fill in. Andrew Tredinnick, USA TODAY, 4 Sep. 2022 But the Wildcats have options to fill in for as long as Rodriguez is gone. Brett Dawson, The Courier-Journal, 3 Sep. 2022 The hour-long appearance began at 7 p.m. CT and was hosted by Chris Stewart, who will also fill in for Eli Gold in the radio booth for Alabama’s opener Saturday night. Mike Rodak | Mrodak@al.com, al, 1 Sep. 2022 Mekari is the rare super-utility lineman who can fill in ably at all five positions. Childs Walker, Baltimore Sun, 31 Aug. 2022 But the Wildcats have a hole to fill in the secondary. Andrew Seligman, Chicago Tribune, 20 Aug. 2022 No defender was within four feet of Green on 212 of his 271 long-range attempts last season, which is the role that Prince would fill in Philly. Bryan Toporek, Forbes, 25 June 2022 Although bioengineers have created machines that can temporarily take over the work of the heart, the lungs and even the kidneys, there is no device or procedure that can fill in for the liver. Brenda Goodman, CNN, 13 May 2022 School district leaders have tapped central-service staff to fill in classes during the month of September. Nicole Asbury, Washington Post, 29 Aug. 2022 See More Word History
First Known Use
Noun
1917, in the meaning defined above
Verb
1840, in the meaning defined at transitive sense 1
fill-in 1 of 2
noun
as in substitute
a person or thing that takes the place of another I'm just a fill-in, so I have no idea where office supplies are kept Synonyms & Similar Words
Relevance
- substitute
- replacement
- backup
- assistant
- surrogate
- stand-in
- sub
- relief
- cover
- alternate
- reserve
- locum tenens
- pinch hitter
- designated hitter
- proxy
- makeshift
- second
- stopgap
- deputy
- understudy
- delegate
- apology
- representative
- rep
- factor
- attorney
- agent
- assignee
- reliever
- successor
- commissary
- envoy
- procurator
- superseder
fill in
2 of 2verb
1
as in to inform
to give information to my friend quickly filled me in on the portion of the movie that I had missed Synonyms & Similar Words
- inform
- tell
- advise
- catch up
- brief
- instruct
- teach
- educate
- verse
- familiarize
- clear
- hip
- enlighten
- keep (someone) posted
- apprise
- let someone know
- alert
- notify
- acquaint
- clue (in)
- advertise
- wise (up)
- disclose (to)
- lecture
- convince
- school
- assure
- reassure
- announce (to)
- certify
- tutor
- warrant
- disabuse
- undeceive
- disillusion
- disenchant
Antonyms & Near Antonyms
- mislead
- misinform
2
as in to substitute
to serve as a replacement usually for a time only she's only filling in while the regular secretary is on vacation Synonyms & Similar Words
- substitute
- stand in
- step in
- take over
- spell
- cover
- sub
- pinch-hit
- understudy
- relieve
- double (as)
- black rat snakes
- black rattlesnake
- black rent
- black rhinoceros
- black ring
- black ring spot
- black robe
- black rock cod
- Black Rock Desert
- black rockfish
- Black Rod
- black root
- black root rot
- black rot
- black rouge
- black rudder fish
- black ruff
- black runner
- black rush
- Black Russian
- black rust
- black sage
- black salamander
- black sally
- black salmon