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
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Relevance
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
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Antonyms & Near Antonyms
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
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Merriam-Webster unabridged
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