Definition of grow up phrasal verb from the Oxford Advanced Learner's Dictionary

  

grow up

 phrasal verb
phrasal verb Youth
 
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Idioms
great/tall oaks from little acorns grow
 
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(saying) something large and successful often begins in a very small way
Phrasal Verbs
  1. 1  (of a person) to develop into an adult She grew up in Boston (= lived there as a child). Their children have all grown up and left home now. grow up to do something He grew up to become a famous pianist. related noun grown-up2 See related entries: Youth
  2. 2  used to tell somebody to stop behaving in a silly way Why don't you grow up? It's time you grew up.
  3. 3to develop gradually A closeness grew up between the two girls.
See the Oxford Advanced American Dictionary entry: grow up