Lexicalised past-participle adjective; describes something covered in unchecked growth or grown excessively large.
Translations
The old railway line was completely overgrown with brambles.
Старая железнодорожная ветка была полностью заросшая ежевикой.
He was an overgrown child who still loved cartoon shows.
Он был переросшим ребёнком, который всё ещё любил мультфильмы.
Definitions
Covered with vegetation that has been allowed to grow wild and untended. The old railway line was completely overgrown with brambles.
Larger or more developed than is normal or appropriate. He was an overgrown child who still loved cartoon shows.