/ ˌəʊvəˈgrəʊn; NAmE ˌoʊvərˈgroʊn/ adjective
1.
overgrown (with sth) ( of gardens, etc. ) covered with plants that have been allowed to grow wild and have not been controlled :
an overgrown path
The garden's completely overgrown with weeds.
2.
(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) .