Become/bɪˈkʌm/ Definition 1 of 3Pro Tip 1/3Career Changes Use 'become' when discussing a change in someone's profession or role. After five years of training, he became a doctor. Pro Tip 2/3Sudden Realization 'Become' often indicates a new realization or understanding. At that moment, it all became clear to her. Pro Tip 3/3Gradual Change It can reflect a gradual process, not only a quick transformation. Over the years, the city became unrecognizable.