Princeton's WordNet

1. underbrush, undergrowth, underwood(noun)

   the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest

Kernerman English Learner's Dictionary

1. undergrowth(noun)ˈʌn dərˌgroʊθ

   all the plants that grow around the bottom of trees

   They searched in the undergrowth for clues.

Wiktionary

1. undergrowth(Noun)

   The plants in a forest which only reach a relatively low height (such as shrubs and bushes).

Webster Dictionary

1. Undergrowth(noun)

   that which grows under trees; specifically, shrubs or small trees growing among large trees

• kreupelhout, struikgewasAfrikaans
• غِطاء أشجار مُنْخَفِضَهArabic
• шубракBulgarian
• vegetação rasteiraPortuguese (BR)
• podrostCzech
• das UnterholzGerman
• underskovDanish
• φυτά που αναπτύσσονται ανάμεσα σε δέντραGreek
• maleza, monte bajoSpanish
• alustaimestik, metsaalune (taimestik)Estonian
• درختچه ها و گیاهانی که زیر درخت می رویندFarsi
• aluskasvillisuusFinnish
• sous-boisFrench
• שִׂיחִיםHebrew
• झाड़-झंखाड़, जो कुछ पेड़ों के नीचे उगेHindi
• grmlje,šikaraCroatian
• bozótHungarian
• semak belukarIndonesian
• botngróðurIcelandic
• sottoboscoItalian
• 下生えJapanese
• 덤불Korean
• pomiškisLithuanian
• pamežsLatvian
• tumbuhan bawahMalay
• kreupelhoutDutch
• kratt, underskogNorwegian
• podszyciePolish
• درختچه ها و گیاهانی که زیر درخت می رویندPersian
• تر ونو لاندى بوټىPashto
• vegetação rasteiraPortuguese
• subarboretRomanian
• подлесокRussian
• podrastSlovak
• podrastSlovenian
• šikaraSerbian
• undervegetationSwedish
• พุ่มไม้Thai
• ağaç altı bitki ve çalılarıTurkish
• 長在樹木周圍的灌木叢或較大植物Chinese (Trad.)
• підлісок, памолодьUkrainian
• درختوں کے مابين اگنے والي چھوٹي جھاڑياں يا بڑے پودےUrdu
• bụi cây thấpVietnamese
• 矮树丛（长在树木周围的灌木丛或较大植物）Chinese (Simp.)