overgrown (adj.)youdaoicibaDictYouDict[overgrown 词源字典]
late 14c., "covered with growth," past participle adjective from overgrow "overspread with foliage" (Old English ofergrowan); see over- + grown, and compare Old English verb ofergrowan "to overgrow." Meaning "having grown too large" is attested from late 15c.[overgrown etymology, overgrown origin, 英语词源]