Princeton's WordNet

1. overgrown(adj)

   covered with growing plants

2. overgrown(adj)

   abounding in usually unwanted vegetation

Kernerman English Learner's Dictionary

1. overgrown(adjective)ˈoʊvɚgrˈoʊn

   (of an area) having plants growing in an uncontrolled way

   an overgrown garden

2. overgrownˈoʊvɚgrˈoʊn

   having grown too big

   to behave like an overgrown kid/puppy

Wiktionary

1. overgrown(Adjective)

   Having large numbers of plants which have become too big, and are hence spoiling the picturesqueness of a garden.

2. overgrown(Adjective)

   (In the form "An overgrown X") Something which has grown bigger but has not changed its character.

   He spends so much money on new technology, he's like an overgrown schoolboy buying toys.

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