mellow out
verb
mellowed out; mellowing out; mellows out
US, informal
: to become relaxed and calm
She mellowed out as she grew older.
: to calm down
You're getting all upset over nothing. You need to mellow out.
Cite this Entry
“Mellow out.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mellow%20out. Accessed 9 Mar. 2026.
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