un ‧ der ‧ growth /ˈʌndəɡrəʊθ $ -dərɡroʊθ-/ BrE AmE noun [uncountable]
[ Word Family: noun : ↑ grower , ↑ growth , ↑ undergrowth , ↑ outgrowth , ↑ overgrowth ; adjective : growing, ↑ grown , ↑ overgrown ; verb : ↑ grow , ↑ outgrow ]
bushes, small trees, and other plants growing around and under bigger trees