/ˌoʊvərˈɡroʊn/
over·grown
BrE /ˌəʊvəˈɡrəʊn/
NAmE /ˌoʊvərˈɡroʊn/
(of gardens, etc.)
covered with plants that have been allowed to grow wild and have not been controlled
an overgrown path
~ with sth
The garden’s completely overgrown with weeds.
(often disapproving)
that has grown too large
an overgrown village
They act like a pair of overgrown children (= they are adults but they behave like children).