Definition of up and
informal
: to do something specified in a sudden and unexpected way
(U.S.) One day, he just up and left home. Then she ups and marries some guy she'd just met. One day, he just upped and left home.
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“Up and.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/up%20and. Accessed 26 Jun. 2022.
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