If a garden or other place is overgrown, it is covered with a lot of untidy plants because it has not been looked after.
例句
We hurried on until we reached a courtyard overgrown with weeds...我們匆匆往前走，來到一個野草叢生的院子。As the equipment was unpacked, I led Lee around the overgrown garden.取出設備后，我帶著李在花草蔓生的花園里轉了一圈。
ADJ
（成年人）不成熟的，孩子氣的
If you describe an adult as an overgrown child, you mean that their behaviour and attitudes are like those of a child, and that you dislike this.
例句
...a bunch of overgrown kids...一幫大孩子Daphne Farlow, at forty-five, still looked and spoke like an overgrown schoolgirl.45歲的達芙妮·法洛外貌言談都還像個稚氣未脫的小女生。
英漢詞典釋義
adj.
雜草叢生
When I came back from my long vacation, I found my garden overgrown.當度完長假歸來時, 我發現我的花園里雜草叢生。