become /bɪˈkʌm/ verb (past tense became, past participle become)
become available/rich/a writer, etc › to begin to be something: They became great friends. She wants to become a teacher when she leaves school. This style of skirt is becoming fashionable.
what/whatever became of sb/sth › something you say when you want to know what has happened to someone: Whatever became of your friend Harry?