Added 9 October 2026 underbrush /ˈʌndɚˌbɹʌʃ/ noun Categories: SocietyRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about underbrush at Wordnik → Where our words come from → The small trees and other plants that clutter the floor of a forest. verb To clear (an area) of underbrush. To work among the underbrush. Related Words: undergrowthunderwoodweedbrushlandbrushwoodtuftbriarwoodshrubmatorralshrubberykrummholzbramble Back to today's word