Pronunciation: [ɡɹˈə͡ʊn ˈʌp] (IPA) 
The spelling of the word "grown up" is a little tricky because it combines the two words "grown" and "up." The first part of the word, "grown," is spelled with the long "o" sound, as in "bone," and the "own" spelling, as in "known." The second part of the word, "up," is spelled with the "uh" sound, as in "hut," and the "p" sound. So, the phonetic transcription of "grown up" would be /groʊn ʌp/.
"Grown up" is an adjective used to describe a person who has reached the age of adulthood or has developed the characteristics and maturity associated with an adult. It refers to an individual who has transitioned from childhood to a more responsible and independent stage of life.
In terms of age, "grown up" commonly denotes someone who has come of age, typically around the legal age of 18, when they are considered legally responsible for their actions. However, the term encompasses more than just reaching a certain age; it includes the psychological, emotional, and behavioral aspects of maturing into an adult. A grown-up person displays qualities such as responsibility, self-reliance, independence, and sound judgment, and is typically engaged in tasks and activities associated with adulthood, such as work, education, maintaining a household, and making important decisions.
Moreover, being a grown-up entails taking on responsibilities and fulfilling societal expectations associated with adulthood. These responsibilities may involve financial and career-related obligations, personal relationships, and being accountable for one's actions. Grown-ups are expected to demonstrate maturity in their interactions, decision-making, and handling of various life situations.
Ultimately, being grown up implies a state of maturity and readiness to handle the challenges and responsibilities that come with adulthood, both in terms of age and behavior.
The etymology of the word "grown up" can be traced back to the Old English language. The word "growan" meant "to grow" or "to increase", while "upp" referred to "up" or "upward". Over time, these words were combined to form the term "grown up", which originally referred to the physical growth and maturity of an individual.
