WordReference Random House Unabridged Dictionary of American English © 2019
un•der•grown  (undər grōn′, un′dər grōn),USA pronunciation adj. 
  1. not grown to normal size or height:sickly and undergrown cattle.
  2. Botanyhaving an undergrowth:an undergrown thicket tangled with creeping vines.
  • 1350–1400; Middle English; see under-, grown

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