fill-in
noun/ˈfɪl ɪn/
/ˈfɪl ɪn/
- a person who does somebody’s job, or a thing that is used instead of another thing, for a short time when they are not available
- There were a number of fill-ins while the host of the show was on holiday.
- a fill-in tour guide
- They opened a takeaway service as a fill-in while the restaurant was being redesigned.
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fill-in