Synonyms of fill-in

fill-in 1 of 2

noun

ˈfil-ˌin 

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

• substitute
• replacement
• backup
• stand-in
• assistant
• surrogate
• relief
• sub
• cover
• reserve
• alternate
• locum tenens
• pinch hitter
• proxy
• designated hitter
• deputy
• delegate
• stopgap
• second
• makeshift
• apology
• factor
• agent
• representative
• attorney
• understudy
• assignee
• rep
• successor
• commissary
• envoy
• procurator
• reliever
• superseder

fill in

2 of 2

verb

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
• instruct
• brief
• teach
• educate
• clue (in)
• hip
• familiarize
• enlighten
• keep (someone) posted
• verse
• apprise
• wise (up)
• let someone know
• clear
• acquaint
• notify
• alert
• disclose (to)
• announce (to)
• advertise
• convince
• lecture
• assure
• reassure
• certify
• school
• warrant
• tutor
• undeceive
• disabuse
• 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
• take over
• step in
• cover
• spell
• sub
• pinch-hit
• double (as)
• relieve
• understudy

Examples of fill-in in a Sentence

Recent Examples on the Web

Noun

Pollak cited a situation in her own school district that has seen a teacher shortage lead to a reliance on a series of fill-in instructors. —Rob Wile, NBC News, 6 Sep. 2024

Yet, Paul Duffy was an excellent fill-in on bass and vocals at the Warfield. —Jim Harrington, The Mercury News, 22 Sep. 2024

Verb

Kmet filled in as the long snapper after Scott Daly suffered a left knee injury while covering the team’s second — and final — punt of the game late in the first quarter. —Brad Biggs, Chicago Tribune, 16 Oct. 2024

This leads people to, at the same time, doubt scientific fact but also attempt to fill in that doubt with untrustworthy, inaccurate and dishonest information. —Erik Klemetti, Discover Magazine, 15 Oct. 2024