as in regression
the act or an instance of going back to an earlier and lower level especially of intelligence or behavior after the birth of his baby brother, the toddler temporarily underwent a kind of reversion, acting like a baby himself

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“Reversion.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/reversion. Accessed 29 Nov. 2022.

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