WordReference Random House Unabridged Dictionary of American English © 2020
growing pains′, 
  1. dull, quasi-rheumatic pains of varying degree in the limbs during childhood and adolescence, often popularly associated with the process of growing.
  2. emotional difficulties experienced during adolescence and preadulthood.
  3. difficulties attending any new project or any rapid development of an existing project:a city plagued with growing pains.
  • 1800–10

Collins Concise English Dictionary © HarperCollins Publishers::
growing pains pl n
  1. pains in muscles or joints sometimes experienced by children during a period of unusually rapid growth
  2. difficulties besetting a new enterprise in its early stages

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