1
as in to testify (to)
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1
as in jam
a crowded mass (as of cars) that impedes or blocks movement
there was the inevitable backup of travelers trying to pass through airport security
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2
as in replacement
a person or thing that takes the place of another
you didn't get the lead position, but you can be the backup to the chosen singer
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as in makeshift
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Thesaurus Entries Near back (up)
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“Back (up).” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/back%20%28up%29. Accessed 7 Jun. 2023.
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