fill-in

[ fil-in ]
/ ˈfɪlˌɪn /

noun

a person or thing that fills in, as a substitute, replacement, or insertion: The company used a fill-in for workers on vacation.
a brief, informative summary; a rundown.

Origin of fill-in

First recorded in 1915–20; noun use of verb phrase fill in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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