The undergrowth is the part of the forest that is below the surface of the ground. It's usually full of plants and trees that have been hidden by the leaves and branches above.
The undergrowth was dense and full of plants.
The undergrowth is a dangerous place because there are snakes and spiders lurking in it.
noun
the brush (small trees and bushes and ferns etc.) growing beneath taller trees in a wood or forest
Synonyms:
1
It feeds on insects in the undergrowth of broadleaf forests.
2
The Chouans let the agent go and scurry into the undergrowth.
3
I am hearing chatter in the undergrowth, if that metaphor applies to the sea.
4
There is little undergrowth in the forest.
5
It feeds on insects in the undergrowth and on the ground.
6
It therefore has little undergrowth.
7
Today it is covered in undergrowth and cacti.
8
They frequented the undergrowth and forest floor.
9
Fearing that it is irretrievably lost in dense undergrowth.
10
In forested groves, there is relatively little undergrowth.