ترعرع doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• تَرَعْرَعَ Form R. Q. 2

  R. Q. 2 تَرَعْرَعَ ذ He (a child, or boy,) became active (تَحَرَّكَ), and grew, grew up, or became a young man, (S, K,) and some add, وَكَبِرَ [and became big, or attained to full growth]. (TA.) [See its part. n., below.…

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