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Old June 23, 2022, 07:19 PM
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wrholt wrholt is offline
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Join Date: Apr 2011
Location: Boston, Massachusetts, USA
Posts: 1,401
Native Language: US English
wrholt is on a distinguished road
I've also found multiple renditions in multiple sources. I tend to use "grownup" for the noun, "grown-up" for the adjective, and "grown up" as the verb form.
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