Definition of one by one
: separately in a series : one at a time : first one and then another one, etc.
I solved the problems one by one. The performers took the stage one by one.
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“One by one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one%20by%20one. Accessed 27 Jun. 2022.
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