Undergrowth (noun)

1. Plants growing beneath a forest canopy.
2. A dense mass of vegetation.

Origin:

Late 19th century: from under- (expressing sub-) + growth.

Examples:

1. The undergrowth was so dense that it was difficult to move forward.
2. The undergrowth provided excellent cover for the animals.
3. The undergrowth was a maze of brambles and vines.
4. The undergrowth was full of birds and other wildlife.
5. The undergrowth was a source of food and medicine for the indigenous people.